元明粉属于（）。

听力原文：M: Hello. Will you please send someone up to my ap...

单项选择题听力原文：M: Hello. Will you please send someone up to my apartment? The hot water is running. And I can't turn it off.
W: There's no one in the office right now. I'll send someone up as soon as I can.
Why did the man want someone to come up to his apartment?
A．There was no hot water.
B．The light couldn't be turned off.
C．There was no heat.
D．The hot water was running.

听力原文：W: Would you like to go the concert with us?M: I'd...

单项选择题听力原文：W: Would you like to go the concert with us?
M: I'd rather watch the football match at home.
What does the man mean?
A．He prefers to listen to music alone.
B．He thinks it is better to stay at home and watch TV.
C．He prefers to go to the football match.
D．He wants to play football than to go home.

即具有自重轻、构造简单、装配化程度高，又属环保、节能型的防水材料是（）。A.混凝土屋面瓦B.金属屋面C.聚氯乙...

单项选择题即具有自重轻、构造简单、装配化程度高，又属环保、节能型的防水材料是（）。