如果柴油机烧机油，发动机排烟的颜色为（）。
A.白色
B.蓝色
C.灰色
D.黑色
参考答案：B
----Why are you late ?
----sorry, the bus I took ______ the mud for half an hour, so I had to walk here.
A．had stuck in
B．has stuck in
C．was stuck in
D．has been stuck in
0 7 26 63________( )
A．125
B．89
C．126
D．124
