, a bat sends out a series of signals, which bounce off any object in its path

Câu hỏi :

            , a bat sends out a series of signals, which bounce off any object in its path

A When in flying

B While it is flying

C When they are flying

D Once flying

* Đáp án

B

* Hướng dẫn giải

Phương pháp giải:

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