相对白天而言，夜间行车，车辆灯光照射的范围小，驾驶人的视野受限。
参考答案：对
I was on the highway when this car went past followed by a police car. They ______ at least 150
km an hour. [ ]
A. should have been doing
B. must have been doing
C. could have done
D. would have done
《丹溪心法》提出头痛不愈各加引经药是
A．太阳加川芎
B．阳明加白芷
C．少阳加柴胡
D．太阴加细辛
E．厥阴加吴茱萸
