高速公路每侧行车带有3条以上车道的，超车时使用相邻的（）车道。
A、左侧
B、右侧
C、左侧或右侧
参考答案：A
— Hi, Johnson, any idea where Susan is?
— It's class time, so she in the classroom now.
A. can be
B. must have been
C. might have been
D. should be
钨钛钴类硬质合金是由碳化钨、碳化钛和( )组成。
A．钒
B．铌
C．钼
D．钴
