开、关门时应提高警惕，注意周围有无（）状况。
A.可疑
B.犯罪
C.违法
D.偷盗
参考答案：A
The driver’s wrong gearing(挂档) was_______for the backward movement of the car, which accidentally knocked down the old woman. [ ]
A. to be blamed
B. blamed
C. to blame
D. blaming
空压机（）小时手动排水一次。
A.1
B.2
C.3
D.4
