2. 外语
  3. A person’s caloric requirements vary ______ his life.

A person’s caloric requirements vary ______ his life.

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问题 A person’s caloric requirements vary ______ his life.
选项 A、over
B、across
C、within
D、throughout
答案D
解析 throughout prep．遍及，贯穿(全过程)，自始至终，从头至尾(不与其他三个搭配)。
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