Mark the letter A, B, C, or D on your answer sheet...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.

Birds are at their most vulnerable when they leave their nests and find food on their own.

A. strong

B. susceptible

C. powerful

D. invincible