高速公路照明系统包括有：（）
A.车道道路照明系统
B.隧道照明系统
C.立交和广场照明系统
D.收费站室内照明系统
参考答案：A, B, C
Bob asked me ________. [ ]
A. what was she doing
B. what is she doing
C. what she was doing
D. what she is doing
浮选及其在矿物分选中的作用。
