12．The car is running at aspeed/rate（速度）of eighty kilometers an hour．

分析 speed

解答 根據(jù)句意"這輛車正以每小時八十千米的速度行駛"，at a speed of…意為"以…的速度"，為固定短語，符合句意．

點評 考查固定短語搭配．a(chǎn)t a speed of短語中的冠詞用a或the區(qū)別不大，可以認為一樣．

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