【题目】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; /
在线课程【答案】C
【解析】
试题分析：句意：我们在海拔6千米处飞行可能午夜到那。at an altitude of+数字“在海拔……处”， altitude开头是元音音标，前用an.“在午夜”用at midnight，是固定短语。故选C.