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20.The car____ downhill at a ______ of 200miles per hour(  )
A.sped,spedB..sped,speedC.speed,spedD.speed,speed

分析 这辆汽车以每小时200英里的速度快速下山.

解答 答案是B.本题考查同一词在不同语境中的含义和用法.speed v,加速,快速行进; n.速度,at the speed of 以…速度;题干中第一空需要的是谓语动词,表示汽车"快速"下山,事件已经发生,所以用过去时,排除C和D;第二空考查短语at the speed of,所以答案选择B项.

点评 本题考查同一词在不同语境中的含义和用法,考生在平时的学习中应注意积累相应的词汇和搭配,并牢记其意思.在做题时,将词义和题干相结合,从语法、句子结构尤其是句意上去判断,句意通顺,符合逻辑,即正确答案.

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