活塞销的作用是连接活塞和连杆小头，将活塞承受的气体作用力传给（）。
A、曲轴
B、连杆
C、活塞顶部
参考答案：B
Einstein, the famous scientist, was born ______ March, 1897.
A．at
B．on
C．in
D．to
The socks are so ______ that they can't be mended any more.
A．used up
B．worn out
C．tired out
D．broken out
