【題目】We are flying at _____ altitude of 6,000 meters and perhaps we will get there at _____ midnight.

A. the; the B. an; the C. an; / D. the; /

【答案】C

【解析】

試題分析：句意：我們在海拔6千米處飛行可能午夜到那。at an altitude of+數(shù)字“在海拔……處”， altitude開頭是元音音標，前用an.“在午夜”用at midnight，是固定短語。故選C.

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