单项选择题

A．go about
B．go over
C．go in for
D．go through
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单项选择题
A．dependentB．a good source of informationC．of great valueD．reliable
A．dependent
B．a good source of information
C．of great value
D．reliable
单项选择题
A．concernsB．issuesC．advantagesD．problems
A．concerns
B．issues
C．advantages
D．problems
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