铝管的最高使用温度不得超过（）℃。A．150 B．160 C．180 D．200

高炉煤气是无色无味的气体。

Do let your mother know the truth. She seems to _______ everything.

A．have told

B．be told

C．have been told

D．being told

For some students, the computer serves only _____ a tool that is used to play games.

A．of

B．in

C．as

D．to

安装膨胀螺钉打孔时打孔深度应（）不能（）。

17世纪法国古典主义最重要的喜剧作家是（）

A.莫里哀

B.高乃依

C.拉辛

D.拉·封丹