（）个气缸或功能相同的若干平衡气缸的压缩叫单级压缩。
A.1
B.2
C.3
D.若干
参考答案：A
句型转换。
1. Could you please follow me?(改为否定句)
Could you please _______ _______ me?
2. —Would you mind waiting for a little while?(作出回答)
—_______ _______ not.
3. This term he is not going to learn French. He'll learn Japanese instead. (同义句转换)
He is going to learn Japanese _______ _______ French this term.
4. They are doing some shopping. (改为一般将来时)
They _______ _______ some shopping next weekend.
5. I'm sorry for being late for school. (就画线部分提问)
_______are you sorry_______?
百分表表盘沿圆周有（）个刻度。
A．50
B．80
C．100
D．150
