Câu hỏi :

Read the passage, then choose the best answer by circling the letter A, B, C or D ( 15p ):

A.When they became amphibious

B. When they were fully adapted to land 

C.After they could walk on two feet

D. If they migrated to sea periodically

* Đáp án

C

* Hướng dẫn giải

Giải thích: Dựa vàoBut they never became completely free of the bonds that tied them to the water; even today many amphibians return to the water to lay their eggs.”

 Đáp án  C

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