矿井风流中硫化氢浓度不超过（）%。

听力原文：M. I still need to wait for the clerk to come back and make some copies of this paper for me.W: Why bother him? I'll show you how easy it is to work the machine.Q: What is the woman going to do?(13)A．Wait for the clerk to return.B．Type the paper for the man.C．Show the man how to use the machine.D．Ask the man not to bother her.

A.
W:
B.
Q:
C.Wait
D.
B．Type
E.
C．Show
F.
D．Ask
G.

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听力原文：M: I need to call my secretary before we leave for the airport.W: I'm afraid there is not much time left, why don't you ask Nick to phone for you?Q: What does the woman suggest the man do?(15)A．Call his secretary himself.B．Ask Nick to phone his secretary.C．Find Nick before they leave.D．Leave for the airport at once.

A.
W:
B.Call
C.
B．Ask
D.
C．Find
E.
D．Leave
F.

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