Read the following passage and mark the letter A, B, c or D on your answer sheet to indicate the correct answer to each of the questions.
Not so many years ago, the word vitamin was known only to a few scientists. Today it is very widely used, and the importance of vitamins in our foods is common knowledge.
Vitamins are life - giving substances found in foods and are needed for the proper growth and general health of the body. The different kinds of vitamins are indicated by letters of the alphabet. At the present time, vitamins A, Bl, B2, c, D, E and G are known. A proper diet should contain a collection of foods in which all of these vitamins are present. Vitamins are also prepared and sold in tablet and capsule form.
Each vitamin has its particular work to do in the life - giving process. Vitamin B1, for example, benefits appetite and digestion. It also helps the body grow. Another vitamin helps the blood to clot, so that danger of bleeding to death in case of injury is lessened. Still another makes the eyes stronger of seeing at night. Airplane pilots need plenty of this vitamin. Scientists think vitamins may have some effect on keeping the hair from turning gray.
28. Which of the following is NOT directly stated in the article but is a reasonable conclusion from the reading?
A. Scientists have known about vitamins for centuries.
B. Vitamins are medicines given to cure diseases.
C. To get all the vitamins a person must eat a variety of foods.
D. A few people know the value of vitamins.
29. This article as a whole is about______.
A. diet in relation to health B. prevention of diseases
C. what vitamins are and what they do D. how scientists discovered vitamins
30. We know the name of vitamins through______.
A. the pictures B. the food
C. the letters of the alphabet D. the different tastes
31. The word “another” in the last paragraph refers to which of the following?
A. vitamin B. food C. diet D. medicine
32. Which of the following is NOT true according to the passage?
A. Vitamins can be taken only by eating the foods in which they are found.
B. Vitamins can be prepared in tablet and capsule form.
C. Vitamins have an important effect on health.
D. Each vitamin has its particular work to do
Đáp án B
Khi xuất hiện “ Not only” ở đầu câu thì ngay sau đó ta phải sử dụng dạng đảo ngữ.
Dịch: Địa chấn học không chỉ được sử dụng để xác định độ sâu của tầng đại dương, mà còn được sử dụng để xác định vị trí dầu.