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My Opinion on Campus Disciplines
Now there is a ......

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单项选择题
All of the following were taken as measures to guard against click fraud EXCEPT
A．the collaboration between an enterpriser and advertisers.
B．the installation of a defense system.
C．the application of certain software.
D．the employment of some statisticians.
单项选择题
The word obscurities in the second paragraph most probably means
A．misunderstanding,
B．small potatoes.
C．well-known people,
D．unclearness.
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