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Insert it is/there is in the spaces. In some sentences, contracted plural, negative and interrogative forms, or the past or future tense are required.1 What's the time? - ... ... 3.30. ~ And what's the date? ~ . . . . . . the 24th.2 How far... ...to York? ~ . . . . . . 50 miles.3 ... ... very stormy last night. ~ Yes, ... ... storms all over the country.4 ... ... freezing very hard. ... ... ...ice on the lake tomorrow.5 As... ... sunny she decided to take the children to the sea.6 Why don't you...
Đọc tiếp

Insert it is/there is in the spaces. In some sentences, contracted plural, negative and interrogative forms, or the past or future tense are required.

1 What's the time? - ... ... 3.30. ~ And what's the date? ~ . . . . . . the 24th.

2 How far... ...to York? ~ . . . . . . 50 miles.

3 ... ... very stormy last night. ~ Yes, ... ... storms all over the country.

4 ... ... freezing very hard. ... ... ...ice on the lake tomorrow.

5 As... ... sunny she decided to take the children to the sea.

6 Why don't you go for a walk? . . . . . . a pity to stay in when . . . . . . so nice outside.

7 ... ... not any shadows because ... ... not any sun.

8 ... ... going to be a bus strike tomorrow. ~ ... ... ...all right if ... ... a fine day; but if ... ... wet ... ... ...
long queues on the Underground.

9 ... ... not any glass in the windows; that is why . . . . . . so cold in the room.

10 ... ... very wet yesterday; ... ... impossible to go out.

11 ... ...a lot of rain last week. ... ... floods everywhere.
12 ... ...a thick fog last night. ... ... several accidents on the motorway.

13 ... ... foolish to drive fast when ... ... foggy.

14 ... ... difficult to find your way round this town. . . . . . . so many streets all looking exactly alike.

15 Come on, children! ... ... time to get up! ... ... nearly breakfast time.

16 . .. . .. ... lunch time when we get to York, so let's have lunch there.~No, ... ... not be time for lunch because our train to Edinburgh leaves York at 13.15.

17 ... ...a funny smell here. ... ... turpentine?

18 ... ...all sorts of stories about Robin Hood, but ... ... not known exactly who he was or what he did.

19 ... ... said that if you break a mirror you'll be unlucky for seven years.

20 As he had very bad sight ... ... difficult for him to recognize people.

21 Can I have a Telegraph, please? said the customer. Im afraid ... ... not any left said the newsagent. But . . . . . . a Guardian on the rack beside you. Why not take that? ... ... just as good.;

22 ... ... not necessary to carry your passport everywhere with you but ... ... advisable to carry some document of identity.

23 ... ...a guard outside the door and ... ... bars on the windows. ... ... impossible to escape.

24 ... ...a garage behind the hotel? ~ Yes, but ... ... rather full. I don't think ... ... room for your car.

25 One night . . . . . . a heavy fall of snow which blocked all the roads. Luckily ... ... plenty of food in the house.

26 ... ...a hotel in the village, so we decided to stay there. . . . . . . a charming village and I was very happy there, but my children were bored because ... ... nothing to do in the evenings.

27 ... ... five flats in the building—one on each floor. Mine's on the top floor. . . . . . . no lift but ... ...supposed to be good for the figure to run up and down stairs, . . . . . .?

28 ... ...a pity you haven't  another bedroom. ~ Yes, but ... ... quite a big loft, which I am thinking of turning into a bedroom. . . . . . . a skylight so ... ... not . . . a ventilation problem.

29 ... ...all sorts of legends about these caves. ... ... said that smugglers hid their goods here and that . . .. . . an underground passage leading to the village inn.

30 Tell me something about King Lear. ~ ………... the story of a king who divided his kingdom between his daughters. ... ... foolish to give away your property like that. . . . . . . never certain that your family will behave generously to you in return.

31 Has Tom any more children?~ Yes. . . . . , . a daughter, Ann.~ Oh yes, ... ... Ann who opened the door to us yesterday, . . . . . .?

32 He thought that ... ... better to say nothing about his change of plan.

33 . .. ...a long time before I got an answer. Then one day a letter arrived—well, ... ... not really a letter,... ... only one sentence on the paper.

34 ... ...a pond beside your house? - Yes, . . . . . . ~ How deep . . . . . .?

35 We'e done all we can. ... ... nothing to do now but wait.

36 Just cross out that word and go on.... ... not necessary to begin again. (or... ...no need to begin again.)

2
12 tháng 9 2021

*Do bài dài nên tớ tách ra nhé

Insert it is/there is in the spaces. In some sentences, contracted plural, negative and interrogative forms, or the past or future tense are required.

1 What's the time? - ...It is ... 3.30. ~ And what's the date? ~ . . . it is. . . the 24th.

2 How far... is it...to York? ~ . . . it is. . . 50 miles.

3 ... ..It was. very stormy last night. ~ Yes, ..there were. ... storms all over the country.

4 ...It is ... freezing very hard. ...There will be ...ice on the lake tomorrow.

5 As... .it was.. sunny she decided to take the children to the sea.

6 Why don't you go for a walk? . . . . It is. . a pity to stay in when . .it is . . . . so nice outside.

7 ... There are... not any shadows because ...there is ... not any sun.

8 ...There is ... going to be a bus strike tomorrow. ~ ... ... It will be..all right if ... .it is.. a fine day; but if ... it is... wet ... .There will be.. ...long queues on the Underground.

9 ... There is... not any glass in the windows; that is why . . . .it is . . so cold in the room.

10 ...It was ... very wet yesterday; ... It was... impossible to go out.

11 ...There was ...a lot of rain last week. ...There were ... floods everywhere.

12 ... ..There was .a thick fog last night. ... ..There were. several accidents on the motorway.

13 ... ..It is. foolish to drive fast when ... ..it is. foggy.

14 ... .It is.. difficult to find your way round this town. . . .There are . . . so many streets all looking exactly a.

15 Come on, children! ...It is ... time to get up! ..It is. ... nearly breakfast time.

12 tháng 9 2021

16 . .. . ..It will be ... lunch time when we get to York, so let's have lunch there.~No, ...it will  ... not be time for lunch because our train to Edinburgh leaves York at 13.15.

17 ...There is ...a funny smell here. ... .Is it.. turpentine?

18 ...There are ...all sorts of stories about Robin Hood, but ... It is... not known exactly who he was or what he did.

19 ... .It is.. said that if you break a mirror you'll be unlucky for seven years.

20 As he had very bad sight ... It was... difficult for him to recognize people.

21 Can I have a Telegraph, please? said the customer. Im afraid ... .there is.. not any left said the newsagent. But . . there is. . . . a Guardian on the rack beside you. Why not take that? ...It is ... just as good.;

22 ... It is... not necessary to carry your passport everywhere with you but ... .It is.. advisable to carry some document of identity.

23 ...There is ...a guard outside the door and ...there are ... bars on the windows. ... .it is.. impossible to escape.

24 ... .Is there..a garage behind the hotel? ~ Yes, but ..it is. ... rather full. I don't think ... there is... room for your car.

25 One night . . .there was . . . a heavy fall of snow which blocked all the roads. Luckily ... .there was.. plenty of food in the house.

26 ..There was. ...a hotel in the village, so we decided to stay there. . . . . It is. . a charming village and I was very happy there, but my children were bored because ..there is. ... nothing to do in the evenings.

27 ...There are ... five flats in the building—one on each floor. Mine's on the top floor. There is. . . . . . no lift but ... .It is..supposed to be good for the figure to run up and down stairs, . isn't it. . . . .?

28 ... It is...a pity you haven't  another bedroom. ~ Yes, but ... .it is.. quite a big loft, which I am thinking of turning into a bedroom. . . . there is. . . a skylight so ... it is... not . . . a ventilation problem.

29 ...There are ...all sorts of legends about these caves. ...It is ... said that smugglers hid their goods here and that . . there is.. . . an underground passage leading to the village inn.

30 Tell me something about King Lear. ~ ……It was…... the story of a king who divided his kingdom between his daughters. ...It is ... foolish to give away your property that. . . It is. . . . never certain that your family will behave generously to you in return.

31 Has Tom any more children?~ Yes. . . it is , . a daughter, Ann.~ Oh yes, ... it is... Ann who opened the door to us yesterday, . . . isn't it. . .?

32 He thought that ...it is ... better to say nothing about his change of plan.

33 . .. It had been...a long time before I got an answer. Then one day a letter arrived—well, ...it was ... not really a letter,... there was... only one sentence on the paper.

34 ... Is there...a pond beside your house? - Yes, . .there is . . . . ~ How deep . is it. . . . .?

35 We'e done all we can. ... there is... nothing to do now but wait.

36 Just cross out that word and go on....it is ... not necessary to begin again. (or...there is ...no need to begin again.)

Insert it is/there is in the spaces. In some sentences, contracted plural, negative and interrogative forms, or the past or future tense are required.1 What's the time? - ... ... 3.30. ~ And what's the date? ~ . . . . . . the 24th.2 How far... ...to York? ~ . . . . . . 50 miles.3 ... ... very stormy last night. ~ Yes, ... ... storms all over the country.4 ... ... freezing very hard. ... ... ...ice on the lake tomorrow.5 As... ... sunny she decided to take the children to the sea.6 Why don't you...
Đọc tiếp

Insert it is/there is in the spaces. In some sentences, contracted plural, negative and interrogative forms, or the past or future tense are required.

1 What's the time? - ... ... 3.30. ~ And what's the date? ~ . . . . . . the 24th.

2 How far... ...to York? ~ . . . . . . 50 miles.

3 ... ... very stormy last night. ~ Yes, ... ... storms all over the country.

4 ... ... freezing very hard. ... ... ...ice on the lake tomorrow.

5 As... ... sunny she decided to take the children to the sea.

6 Why don't you go for a walk? . . . . . . a pity to stay in when . . . . . . so nice outside.

7 ... ... not any shadows because ... ... not any sun.

8 ... ... going to be a bus strike tomorrow. ~ ... ... ...all right if ... ... a fine day; but if ... ... wet ... ... ...long queues on the Underground.

9 ... ... not any glass in the windows; that is why . . . . . . so cold in the room.

10 ... ... very wet yesterday; ... ... impossible to go out.

11 ... ...a lot of rain last week. ... ... floods everywhere.12 ... ...a thick fog last night. ... ... several accidents on the motorway.

13 ... ... foolish to drive fast when ... ... foggy.

14 ... ... difficult to find your way round this town. . . . . . . so many streets all looking exactly alike.

15 Come on, children! ... ... time to get up! ... ... nearly breakfast time.

 

1
12 tháng 9 2021

1 What's the time? - ...It is ... 3.30. ~ And what's the date? ~ . . . it is. . . the 24th.

2 How far... is it...to York? ~ . . . it is. . . 50 miles.

3 ... ..It was. very stormy last night. ~ Yes, ..there were. ... storms all over the country.

4 ...It is ... freezing very hard. ...There will be ...ice on the lake tomorrow.

5 As... .it was.. sunny she decided to take the children to the sea.

6 Why don't you go for a walk? . . . . It is. . a pity to stay in when . .it is . . . . so nice outside.

7 ... There are... not any shadows because ...there is ... not any sun.

8 ...There is ... going to be a bus strike tomorrow. ~ ... ... It will be..all right if ... .it is.. a fine day; but if ... it is... wet ... .There will be.. ...long queues on the Underground.

9 ... There is... not any glass in the windows; that is why . . . .it is . . so cold in the room.

10 ...It was ... very wet yesterday; ... It was... impossible to go out.

11 ...There was ...a lot of rain last week. ...There were ... floods everywhere.

12 ... ..There was .a thick fog last night. ... ..There were. several accidents on the motorway.

13 ... ..It is. foolish to drive fast when ... ..it is. foggy.

14 ... .It is.. difficult to find your way round this town. . . .There are . . . so many streets all looking exactly alike.

15 Come on, children! ...It is ... time to get up! ..It is. ... nearly breakfast time.

Insert it is/there is in the spaces. In some sentences, contracted plural, negative and interrogative forms, or the past or future tense are required. 16 . .. . .. ... lunch time when we get to York, so let's have lunch there.~No, ... ... not be time for lunch because our train to Edinburgh leaves York at 13.15.17 ... ...a funny smell here. ... ... turpentine?18 ... ...all sorts of stories about Robin Hood, but ... ... not known exactly who he was or what he did.19 ... ... said that if you...
Đọc tiếp

Insert it is/there is in the spaces. In some sentences, contracted plural, negative and interrogative forms, or the past or future tense are required.

 

16 . .. . .. ... lunch time when we get to York, so let's have lunch there.~No, ... ... not be time for lunch because our train to Edinburgh leaves York at 13.15.

17 ... ...a funny smell here. ... ... turpentine?

18 ... ...all sorts of stories about Robin Hood, but ... ... not known exactly who he was or what he did.

19 ... ... said that if you break a mirror you'll be unlucky for seven years.

20 As he had very bad sight ... ... difficult for him to recognize people.

21 Can I have a Telegraph, please? said the customer. Im afraid ... ... not any left said the newsagent. But . . . . . . a Guardian on the rack beside you. Why not take that? ... ... just as good.;

22 ... ... not necessary to carry your passport everywhere with you but ... ... advisable to carry some document of identity.

23 ... ...a guard outside the door and ... ... bars on the windows. ... ... impossible to escape.

24 ... ...a garage behind the hotel? ~ Yes, but ... ... rather full. I don't think ... ... room for your car.

25 One night . . . . . . a heavy fall of snow which blocked all the roads. Luckily ... ... plenty of food in the house.

26 ... ...a hotel in the village, so we decided to stay there. . . . . . . a charming village and I was very happy there, but my children were bored because ... ... nothing to do in the evenings.

27 ... ... five flats in the building—one on each floor. Mine's on the top floor. . . . . . . no lift but ... ...supposed to be good for the figure to run up and down stairs, . . . . . .?

28 ... ...a pity you haven't  another bedroom. ~ Yes, but ... ... quite a big loft, which I am thinking of turning into a bedroom. . . . . . . a skylight so ... ... not . . . a ventilation problem.

29 ... ...all sorts of legends about these caves. ... ... said that smugglers hid their goods here and that . . .. . . an underground passage leading to the village inn.

30 Tell me something about King Lear. ~ ………... the story of a king who divided his kingdom between his daughters. ... ... foolish to give away your property like that. . . . . . . never certain that your family will behave generously to you in return.

31 Has Tom any more children?~ Yes. . . . . , . a daughter, Ann.~ Oh yes, ... ... Ann who opened the door to us yesterday, . . . . . .?

32 He thought that ... ... better to say nothing about his change of plan.

33 . .. ...a long time before I got an answer. Then one day a letter arrived—well, ... ... not really a letter,... ... only one sentence on the paper.

34 ... ...a pond beside your house? - Yes, . . . . . . ~ How deep . . . . . .?

35 We'e done all we can. ... ... nothing to do now but wait.

36 Just cross out that word and go on.... ... not necessary to begin again. (or... ...no need to begin again.)

1
12 tháng 9 2021

16 . .. . ..It will be ... lunch time when we get to York, so let's have lunch there.~No, ...it will  ... not be time for lunch because our train to Edinburgh leaves York at 13.15.

17 ...There is ...a funny smell here. ... .Is it.. turpentine?

18 ...There are ...all sorts of stories about Robin Hood, but ... It is... not known exactly who he was or what he did.

19 ... .It is.. said that if you break a mirror you'll be unlucky for seven years.

20 As he had very bad sight ... It was... difficult for him to recognize people.

21 Can I have a Telegraph, please? said the customer. Im afraid ... .there is.. not any left said the newsagent. But . . there is. . . . a Guardian on the rack beside you. Why not take that? ...It is ... just as good.;

22 ... It is... not necessary to carry your passport everywhere with you but ... .It is.. advisable to carry some document of identity.

23 ...There is ...a guard outside the door and ...there are ... bars on the windows. ... .it is.. impossible to escape.

24 ... .Is there..a garage behind the hotel? ~ Yes, but ..it is. ... rather full. I don't think ... there is... room for your car.

25 One night . . .there was . . . a heavy fall of snow which blocked all the roads. Luckily ... .there was.. plenty of food in the house.

26 ..There was. ...a hotel in the village, so we decided to stay there. . . . . It is. . a charming village and I was very happy there, but my children were bored because ..there is. ... nothing to do in the evenings.

27 ...There are ... five flats in the building—one on each floor. Mine's on the top floor. There is. . . . . . no lift but ... .It is..supposed to be good for the figure to run up and down stairs, . isn't it. . . . .?

28 ... It is...a pity you haven't  another bedroom. ~ Yes, but ... .it is.. quite a big loft, which I am thinking of turning into a bedroom. . . . there is. . . a skylight so ... it is... not . . . a ventilation problem.

29 ...There are ...all sorts of legends about these caves. ...It is ... said that smugglers hid their goods here and that . . there is.. . . an underground passage leading to the village inn.

30 Tell me something about King Lear. ~ ……It was…... the story of a king who divided his kingdom between his daughters. ...It is ... foolish to give away your property like that. . . It is. . . . never certain that your family will behave generously to you in return.

31 Has Tom any more children?~ Yes. . . it is , . a daughter, Ann.~ Oh yes, ... it is... Ann who opened the door to us yesterday, . . . isn't it. . .?

32 He thought that ...it is ... better to say nothing about his change of plan.

33 . .. It had been...a long time before I got an answer. Then one day a letter arrived—well, ...it was ... not really a letter,... there was... only one sentence on the paper.

34 ... Is there...a pond beside your house? - Yes, . .there is . . . . ~ How deep . is it. . . . .?

35 We'e done all we can. ... there is... nothing to do now but wait.

36 Just cross out that word and go on....it is ... not necessary to begin again. (or...there is ...no need to begin again.)

18 tháng 2 2022

2Change into Negative/ Interrogative form.

a. There are some bananas in the fridge. (Negative)

There aren't any bananas in the fridge. 

b. There is some bread in the fridge. (Negative)

=> There isn't any bread in the fridge.

c. There are some beautiful flowers in the garden. (Interrogative)

=> Are there any beautiful flowers in the garden?

d. There is some cheese in the cupboard. (Interrogative)

=> Are there any cheese in the cupboard? 
18 tháng 2 2022

con ngừi thật chăm chỉ:>

25 tháng 3 2016

There are four (1)....seasons...............in a year.They (2).....are..........spring,summer,fall and (3)...winter..........In the spring, the weather is ususlly warm.Sometime it is cold (4).and.......not very cold.There (5).are..........many flowers in the spring.In the summer,the day is long and the night is short.people often(6)...go........swimming in this season.The fall is the season of fruits.In the winter,it's usually very(7) ....cold.........The day is short and the (8)..night........is long

1. How many seasons are there in a year?
→There are four seasons in a year

2.What are they?
→They are spring,summer,autumn and winter
 

3.Is it usually warm in the spring?
→Yes,it is

4.What are there in the spring?
→There are many flowers in spring

5. Is the day long or short in the summer?
→The day is long in the summer

6 is the day long or short in the winter?
→The day is short in the winter 

7. What's the weather like in the winter?
→The weather is cold in the winter

8.What do people often do in the summer?
→People often go swimming in the summer

9.Is the fall the seeson of fruits?
→Yes it is

10.Is the night short in the winter?
→No ,it isn't

There are four seasons in a year. They are spring, summer, fall and winter. In the spring, the weather is usualy warm. Sometime it is cold but not very cold. There are many flowers in the spring. In the summer, the day is long and the night is short. People often go swimming in this season. The fall is the seeson of fruits. In the winter it's usualy very cold. The day is short and the night is long.

1)There are four seasons in a year

2)They are spring, summer, fall and winter

3)Yes, it is

4)There are many flowers in the spring

5)The day in summer is long

6)The day in winter is short

7)It is very cold in winter

9)Yes, it is

10)No, it isn't

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42. Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed....
Đọc tiếp

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.

Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed. Although bioluminescence is a relatively complicated process, it can be reduced to simple terms. Living light occurs when luciferin and oxygen combine in the presence of luciferase. In a few cases, fireflies the most common, an additional compound called ATP is required.

The earliest recorded experiments with bioluminescence in the late 1800s are attributed to Raphael Dubois, who extracted a luminous fluid from a clam, observing that it continued to glow in the test tube for several minutes. He named the substance luciferin, which means “the bearer of life”. In further research, Dubois discovered that several chemicals were required for bioluminescence to occur. In his notes, it was recorded that a second important substance, which he called luciferase, was always present. In later study of small, luminous sea creatures, Newton Harley concluded that luciferin was composed of carbon, hydrogen, and oxygen, which are the building blocks of all living cells. He also proved that there are a variety of luciferin and luciferase, specific to the plants and animals that produce them.

Much remains unknown, but many scientists who are studying bioluminescence now believe that the origin of the phenomenon may be traced to a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to the atmosphere, it was actually poisonous to life forms, plants and animals produced light to use up the oxygen in a gradual but necessary adaptation. It is speculated that millions of years ago, all life may have produced light to survive. As the millennia passed, life forms on Earth became tolerant of, and finally dependent on oxygen, and the adaptation that produced bioluminescence was no longer necessary, but some primitive plants and animals continued to use the light for new functions such as mating or attracting prey.

Question 36: Which of the following is the main topic of the passage?

A. Cold light

B. Luciferase

C. Primitive plants and animals

D. Earth’s atmosphere

1
22 tháng 2 2019

Đáp án A

Dịch nghĩa: Chủ đề chính của bài viết là gì?

A. Ánh sáng lạnh

B. Luciferase

C. Thực vật và động vật nguyên thủy

D. Khi hậu trên trái đất

Giải thích: Ta thấy đoạn văn chủ yếu nói về bioluminescence (sự phát quang sinh học) hay còn gọi là cold light (ánh sáng lạnh)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42. Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed....
Đọc tiếp

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.

Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed. Although bioluminescence is a relatively complicated process, it can be reduced to simple terms. Living light occurs when luciferin and oxygen combine in the presence of luciferase. In a few cases, fireflies the most common, an additional compound called ATP is required.

The earliest recorded experiments with bioluminescence in the late 1800s are attributed to Raphael Dubois, who extracted a luminous fluid from a clam, observing that it continued to glow in the test tube for several minutes. He named the substance luciferin, which means “the bearer of life”. In further research, Dubois discovered that several chemicals were required for bioluminescence to occur. In his notes, it was recorded that a second important substance, which he called luciferase, was always present. In later study of small, luminous sea creatures, Newton Harley concluded that luciferin was composed of carbon, hydrogen, and oxygen, which are the building blocks of all living cells. He also proved that there are a variety of luciferin and luciferase, specific to the plants and animals that produce them.

Much remains unknown, but many scientists who are studying bioluminescence now believe that the origin of the phenomenon may be traced to a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to the atmosphere, it was actually poisonous to life forms, plants and animals produced light to use up the oxygen in a gradual but necessary adaptation. It is speculated that millions of years ago, all life may have produced light to survive. As the millennia passed, life forms on Earth became tolerant of, and finally dependent on oxygen, and the adaptation that produced bioluminescence was no longer necessary, but some primitive plants and animals continued to use the light for new functions such as mating or attracting prey.

Question38: The word “primitive” is closest meaning to ______.

A. very old

B. very large

C. very important

D. very common

1
24 tháng 3 2017

Đáp án A

Dịch nghĩa: Từ “primitive” gần nghĩa nhất với _______.

A. rất nhiều tuổi

B. rất lớn

C. rất quan trọng

D. rất phổ biến

Giải thích: be primitive: rất lâu đời, nguyên thủy = very old

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42. Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed....
Đọc tiếp

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.

Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed. Although bioluminescence is a relatively complicated process, it can be reduced to simple terms. Living light occurs when luciferin and oxygen combine in the presence of luciferase. In a few cases, fireflies the most common, an additional compound called ATP is required.

The earliest recorded experiments with bioluminescence in the late 1800s are attributed to Raphael Dubois, who extracted a luminous fluid from a clam, observing that it continued to glow in the test tube for several minutes. He named the substance luciferin, which means “the bearer of life”. In further research, Dubois discovered that several chemicals were required for bioluminescence to occur. In his notes, it was recorded that a second important substance, which he called luciferase, was always present. In later study of small, luminous sea creatures, Newton Harley concluded that luciferin was composed of carbon, hydrogen, and oxygen, which are the building blocks of all living cells. He also proved that there are a variety of luciferin and luciferase, specific to the plants and animals that produce them.

Much remains unknown, but many scientists who are studying bioluminescence now believe that the origin of the phenomenon may be traced to a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to the atmosphere, it was actually poisonous to life forms, plants and animals produced light to use up the oxygen in a gradual but necessary adaptation. It is speculated that millions of years ago, all life may have produced light to survive. As the millennia passed, life forms on Earth became tolerant of, and finally dependent on oxygen, and the adaptation that produced bioluminescence was no longer necessary, but some primitive plants and animals continued to use the light for new functions such as mating or attracting prey.

Question 41: Bioluminescence is described as all of the following EXCEPT ______.

A. a complex chemicals process

B. an adaptation of early plants and animals to the environment

C. a form of cold light

D. a poisonous substance

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16 tháng 11 2018

Đáp án D

Dịch nghĩa: Sự phát quang sinh học được miêu tả như tất cả những điều sau NGOẠI TRỮ _______.

A. một quá trình hóa học phức tạp

B. một sự thích ứng của những loài động thực vật tiền sử với môi trường

C. một dạng ánh sáng lạnh

D. một chất có độc

Giải thích: Ta thấy các đáp án còn lại đều được nói đến như những đặc tính của sự phát quang sinh học:

A. Đoạn 1: “Although bioluminescence is a relatively complicated process, it can be reduced to simple terms” - “Mặc dù sự phát quang sinh học là một quá trình tương đối phức tạp, nó có thể được giảm xuống đến những khái niệm đơn giản.”

B. Đoạn cuối: “It is speculated that millions of years ago, all life may have produced light to survive” - “Người ta đoán rằng hàng triệu năm về trước, toàn bộ sự sống có thể đã phải tạo ra ánh sáng để sinh tồn.”

C. Câu đầu bài viết: “Light from a living plant or animal is called bioluminescence, or cold light...” - “Ánh sáng từ một loài động vật hay thực vật còn sống được gọi là sự phát quang sinh học, hay ánh sáng lạnh. . .”