抽油泵完成排液，主要发生在（）。
A.上冲程
B.下冲程
C.上冲程和下冲程
D.上冲程或下冲程
参考答案：B
I like English. I want __________some foreign friends.
A．make
B．made
C．to make
D．making
Please join us. We need _____ actors in our play. [ ]
A. a lot
B. a little
C. plenty of
D. a bit of
