A. frowning B. a lot of fibers C. to digest food D. to function properly E. whenever we are happy F. wheneve

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问题     A. frowning
    B. a lot of fibers
    C. to digest food
    D. to function properly
    E. whenever we are happy
    F. whenever we do something
Muscles don’t have to be very big________.

选项

答案D

解析 题干的中心词是big。由第一段“When we think of muscles,we…to work well.”可知,实际上肌肉并不一定要像我们想象的那样才能正常工作,也就是说并不是发达的肌肉才能正常工作。选项D符合题意。
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