单项选择题

A．concerns
B．issues
C．advantages
D．problems
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单项选择题
A．deficienciesB．weaknessesC．insufficienciesD．limitations
A．deficiencies
B．weaknesses
C．insufficiencies
D．limitations
单项选择题
A．go aboutB．go overC．go in forD．go through
A．go about
B．go over
C．go in for
D．go through
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