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Vitamins are similar because they are ma

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问题 Vitamins are similar because they are made of the same elements—usually carbon,hydrogen,oxygen,and sometimes nitrogen.They are different in that their elements are arranged differently,and each vitamin been（ ）one or more specific functions in the body.A.holdsB.playsC.performs
选项 A.holds
B.plays
C.performs
答案 A
解析 根据句意，所选项要有“起作用”的含义。四个选项中，只有D.perform“执行，履行”与function相搭配，意为“起作用”。A.undertake“着手，承担”；B.hold“抓住，掌握”；C.play常和part或role搭配，也可表达“起作用”之意。
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