According to paragraph 4, the pigeons moved to the opposite end of a cage because

Câu hỏi :

According to paragraph 4, the pigeons moved to the opposite end of a cage because

A The magnetic field was normal

B The magnetic field was stronger at one end

C The magnetic field changed its polarity

D The magnetic field was removed

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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