According to the passage, what makes mobile phones potentially harmful is

Câu hỏi :

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

A. their radiant light

B. their power of attraction

C. their raiding power

D. their invisible rays

* Đáp án

D

* Hướng dẫn giải

Chọn D

D. their invisible rays

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