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    【题目】Researchers are now conducting hibernation experiments and can use chemicals to put living cells into sleep-like state they don’t age.

    A. for which B. that

    C. where D. which

    【答案】C

    【解析】试题分析：考查定语从句及其关系词的使用。句意：研究人员现在正在作冬眠实验，他们可以使用化学药物使活着的细胞进入睡眠状态，在这个状态中他们不会变老。先行词为state, 在从句中作地点状语，故C正确。

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