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

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
A single muscle contains________.
选项
答案B
解析 题干的中心词是contains。由第三段第一句“A muscle is made of tiny fibers．”可知，肌肉由许多细小的纤维组成。选项B符合题意。
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