行车事故主要有（）、脱轨等。
A.冲突
B.电气化铁路接触网触电
C.列车火灾
D.机车车辆伤害
参考答案：A, B, C, D
—Did you see the new movie directed by that famous director? It’s said to be ___ great fun.
---No, I have been busy repairing all the broken office___ these days.
A．a, equipment
B．the, equipment
C．/, equipments
D．/, equipment
下列地貌类型中属堆积地貌的是( )。
A．(A) 黄土峁
B．(B) 黄土冲沟
C．(C) 黄土柱
D．(D) 黄土崩塌堆积体
