出口车道系统有下列哪些模式（）
A.计重模式
B.降级模式
C.车型模式
D.免征模式
参考答案：A, B
The pencil is Danny's mouth.[ ]
A. in
B. are
C. where
－Mum, I play computer games?
－Yes, you can. But you have to finish your homework first. [ ]
A. must
B. may
C. will
D. need
