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 最近的一項研究展示了水的結(jié)冰溫度是如何通過電荷來改變．

解答 答案：A
題干中water freezes是修飾temperature的一個非限制性定語從句；從句中freeze與先行詞temperature之間要添加介詞at，即freeze at the temperature．故選A．

點評 定語從句是用來修飾名詞的形容詞性從句，相當于一個形容詞．連接定語從句的引導(dǎo)詞分為關(guān)系代詞和關(guān)系副詞，關(guān)系代詞在從句中要作主語或賓語；關(guān)系副詞在從句中作狀語．這也是選擇關(guān)系詞的一個判斷方法．

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