【題目】The rocket will travel to Mars _________ a speed of over 25,000 miles per hour.

A. at B. by C. with D. for

【答案】A

【解析】

試題分析：句意：火箭將會以每小時25000里的速度旅行到火星。此題考查介詞，at the speed of以……速度。根據(jù)句意，應(yīng)選A。

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