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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 最近的一項(xiàng)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(gè)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(diǎn)評 定語從句是用來修飾名詞的形容詞性從句,相當(dāng)于一個(gè)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(gè)判斷方法.

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