2. 外语
  3. If we find the genes that control the human body clock，we can perhaps slow them down and extend human life（ ）a little.

If we find the genes that control the human body clock，we can perhaps slow them down and extend human life（ ）a little.

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问题 If we find the genes that control the human body clock，we can perhaps slow them down and extend human life（ ）a little.
选项 A、expectation
B、terminal
C、expectancy
D、range
答案D
解析
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