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    18．A recent study showed how the temperature，______ water freezes，can be changed using electric charges．（　　）
    A．at whichB．for whichC．in whichD．with which

    分析 最近的一项研究展示了水的结冰温度是如何通过电荷来改变．

    解答 答案：A
    题干中water freezes是修饰temperature的一个非限制性定语从句；从句中freeze与先行词temperature之间要添加介词at，即freeze at the temperature．故选A．

    点评 定语从句是用来修饰名词的形容词性从句，相当于一个形容词．连接定语从句的引导词分为关系代词和关系副词，关系代词在从句中要作主语或宾语；关系副词在从句中作状语．这也是选择关系词的一个判断方法．

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