单项选择题

A．which
B．when
C．where
D．whenever
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单项选择题
A．City people smoke less than people living on farms.B．The better-educated men tend to smoke more heavily than those with lower income.C．The better-educated women tend to smoke more heavily.D．A well-paid man is likely to smoke more packs of cigarettes per day.
A．City people smoke less than people living on farms.
B．The better-educated men tend to smoke more heavily than those with lower income.
C．The better-educated women tend to smoke more heavily.
D．A well-paid man is likely to smoke more packs of cigarettes per day.
单项选择题
A．levelB．costC．standardD．grade
A．level
B．cost
C．standard
D．grade
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