听力原文:You look tired. Would you like to have a drink?
(2)
A.No, I won't.
B.Yes, you look tired.
C.No, thanks.
D.You are welcome.
第3题
《规程》规定:矿井空气中一氧化碳的最高允许浓度为()。
A.0.024%
B.0.0024%
C.0.00024%
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