为了防止列车在制动失效的情况下发生溜逸事故，车站线路的坡度一般不大5‰。（）
参考答案：错
I can see __________ the duck.[ ]
A. /
B. two
C. three
D. a
Please go and find out __________.
A．that the bus will arrive
B．why will the bus arrive
C．when the bus will arrive
D．when will the bus arrive
