我国的月球探测卫星，从发射到进入月球轨道大约需要飞行（）
A、72小时。
B、5—6天。
C、8—9天。
D、半个月。
参考答案：C
1. In this factory, suggestions often have to wait for months before they are fully _____.
A．admitted
B．acknowledged
C．absorbed
D．considered
The little girl devoted all her time the piano.
A．to practice playing
B．to practicing playing
C．for practice playing
D．for practicing playing
