Câu hỏi :

The word more in line 9 refers to.......

A. muscles

B. fast-twitch fibers

C. Olympic weightlifters

D. average people

* Đáp án

B

* Hướng dẫn giải

Dẫn chứng: ...have a large number of fast-twitch fibers in their muscles-many more than the average person.

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