Question

[Lê Quỳnh Anh]

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 from 30 to 34.

Genetic modification of foods is not a new practice. It has been practiced for thousands of years under the name of "selective breeding". Animals and plants were chosen because they had traits that humans found useful. Some animals were larger and stronger than others, or they yielded more food, or they had some other trait that humans valued. Therefore, they were bred because of those traits. Individuals with those traits were brought together and allowed to breed in the hope that their offspring would have the same traits in greater measure.

Much the same thing was done with plants. To produce bigger or sweeter fruit, or grow more grain per unit of land, strains of plants were combined and recombined to produce hybrids, or crossbreeds that had the desired traits in the right combinations. All the while, however, biologists wondered: is there a more direct and versatile way to change the traits of plants and animals? Could we rewrite, so to speak, the heredity of organisms to make them serve our needs better?

In the 20th century, genetic modification made such changes possible at last. Now, it was possible to alter the genetic code without using the slow and uncertain process of selective breeding. It even became possible to blend plants and animals genetically: to insert animal genes into plants, for example, in order to give the plants a certain trait they ordinarily would lack, such as resistance to freezing. The result was a tremendous potential to change the very nature of biology

According to the passage, selective breeding ______. 

A. is slower and uncertain than genetic modification 

B. works much better on plants than on animals 

C. helps change the traits of plants rather than animals 

D. has a huge potential to change the nature of biology 

Answer 1

[Dương Hoàn Anh]

Chọn A

Kiến thức: Đọc hiểu

Giải thích:

Theo như đoạn văn, việc gây giống có chọn lọc

  A. thì chậm hơn và không chắc chắn hơn là biến đổi gen

  B. hiệu quả tốt trên thực vật hơn trên động vật

  C. giúp thay đổi các đặc tính của thực vật hơn là động vật

  D. có tiềm năng to lớn để thay đổi bản chất của sinh học

Thông tin: Now, it was possible to alter the genetic code without using the slow and uncertain process of selective breeding.

Tạm dịch: Ngày nay, có khả năng để thay đổi mã di truyền mà không cần sử dụng quá trình gây giống có chọn lọc vừa chậm và không chắc chắn nữa