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【单选题】
4组含C1～C7的结点序列中，哪一种是图3有向图的拓扑序列(35)。A.
C1，C2，C6，C7，C5，C4，C3
B.
C1，C2，C6，C3，C4，C5，C7
C.
C1，C4，C2，C3，C5，C6，C7
D.
C5，C7，C4，C1，C2，C6，C3
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反馈参考答案：
举一反三
【单选题】—Jim, you ______ quiet! Don’t you know it’s time for class now? —Sorry, sir.
A.
being
B.
be
C.
are
D.
will be
【单选题】—Have you that Amy’s a little quiet these days? —Yes, I wonder what has happened to her．
A.
looked
B.
reminded
C.
noticed
D.
Revised
【单选题】--Why do you like living here？ -- Because it’s quite quiet. There are cars on the street.
A.
a lot of
B.
a few
C.
few
D.
little
【简答题】You are enjoying the beautiful scenery in a quiet place, but suddenly the peace and quiet is interrupted（打断）by the noisy sound of a cellphone(手机)! Cellphones are everywhere, and some people don’t know...
【单选题】—You see, there are a lot of cars and people on the street. —Yes, it's very _____. [ ]
A.
quiet
B.
long
C.
busy
D.
free
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