单项选择题
A.dependent
B.a good source of information
C.of great value
D.reliable
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单项选择题
A.concernsB.issuesC.advantagesD.problems
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
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