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
Smooth muscles help us________.

选项

答案C

解析 题干的中心词是smooth muscles。由第四段第二句、第三句和第四句“smooth muscles are the ones…our food.”可知,我们不能控制平滑肌,这种肌肉在悄无声息地维持我们身体的正常运转,同时它帮助我们吸收食物。选项C符合题意。
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