汽车在夜间行驶时，驾驶室内一般不开灯，为什么？

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问题问答题

答案

夜间开灯后，车前的挡风玻璃相当于平面镜，会把驾驶室的景物反射到驾驶员的眼睛里，使其看不清车前较暗的情况，容易引发交通事故

选择题

— You know that you were driving at 100 kilometres an hour, _____?

— No, officer, I couldn't have been. This car can't do more than 80. [ ]

A. don't you

B. weren't you

C. did you

D. are you

填空题

5米光感是查（）的功能；1米的9个方位是查（）的功能。