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【单选题】
下列哪种情况下不会出现市场失灵（）。A.
存在公共物品
B.
存在外部效应
C.
卡特尔勾结起来限制产量
D.
市场上竞争非常激烈
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参考解析：
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皮皮学刷刷变学霸
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【简答题】纯净饱和蒸气膜状凝结的主要热阻是 。
【单选题】Did you notice the ______ on the doctor's face when he heard that Kino had found the pearl of the world?
A.
appearance
B.
expression
C.
description
D.
look
【单选题】听力原文：W: Did you notice that Mike cut off his beard over the summer? M: Notice? I didn't even recognize him. Q: What docs the man imply? (13)
A.
He hadn't noticed any change in Mike.
B.
Mike looks different without a beard.
C.
He thinks Mike looked better with the beard.
D.
He hasn't seen Mike yet.
【简答题】Did you notice him come in?
【单选题】Did you notice the guy () head looked like a big potato?
A.
who
B.
which
C.
whose
D.
whom
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