Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions from 48 to 50.

A child is influenced as much by his schooling as by his parents.

A. A child’s parents have greater influence on him than his schooling.

B. Schooling doesn’t influence a child as much as his parents do.

C. A child can influence his parents as much as his schooling.

D. A child’s schooling influences him as much as his parents do.

Thực hiện phép tính:

a ,   40 + 9. 1 − 6 b ,   50 + 8. 8 − 16

Ở các loài vi khuẩn, các nhà khoa học thường dùng tiêu chuẩn nào để phân biệt loài?

A. Tiêu chuẩn hình thái.

B. Tiêu chuẩn hóa sinh.

C. Tiêu chuẩn hình thái và cách li sinh sản.

D. Cách li sinh sản.