中小型柴油机活塞外圆的磨损发生在（）。
A.活塞头部左右方向
B.活塞头部前后方向
C.活塞裙部左右方向
D.活塞裙部前后方向
参考答案：C
_____, I was afraid of the dark, then I went to bed with my bedroom light ____.
A．To begin, off
B．Begin with,on
C．Start , off
D．To begin with, on
—Is this your sister?
—Yes, it is. _______ name is Linda.
A．Your
B．My
C．His
D．Her
