单选题：Whatwillhappenasanimalsbecomeolder?

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  • 题目类型：单选题
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题目内容：

Whatwillhappenasanimalsbecomeolder? A．Communicationbetweencellsdisappears.
B．LevelsofNADnearlydropbyhalf.
C．Themetabolismofthecellbecomesfaster.
D．Thecellbecomesvulnerabletocommonagingattacks.

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