单项选择题

New problems took their place – the unprecedented problems of an ________ society.

A、affluence
B、affluent
C、dogged
D、sanitary

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If you fit the ________ averages, by the age of 20 you will have been exposed to at least 20000 hours of television.

A、statistical
B、statistics
C、statistic
D、statistically

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An excited group of children ______________ out of school.

A、left
B、squandered
C、tumbled
D、courted