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
Our muscles are working________.

选项

答案F

解析 题干的中心词是working。由第二段最后一句“In fact,every time we move,we use some of the muscles in our body.”可知,只要我们活动,我们就会用到某些肌肉。选项F符合题意,
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