Read the following passage and m...

Câu hỏi: Read the following passage and mark the letter A, B, C, or D on your answer sheer to indicate the correct answer to each of the numbered blanks from 37 to 44.

A. The care that various animals give to their offspring 

B. The difficulties young animals face in obtaining

C. The methods that mammals use to nurse their young 

D. The importance among young mammals of becoming independent