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

分析 speed

解答 根据句意"这辆车正以每小时八十千米的速度行驶",at a speed of…意为"以…的速度",为固定短语,符合句意.

点评 考查固定短语搭配.at a speed of短语中的冠词用a或the区别不大,可以认为一样.

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