题目内容

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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