单项选择题

Passage One

A．Prices are lower in downtown stores.
B．Job opportunities are better there.
C．Highway commuting has become unpleasant.
D．Environmental pollution is no longer a problem.
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单项选择题
A．Environmental protection.B．Pest control.C．House construction.D．Fire prevention.
A．Environmental protection.
B．Pest control.
C．House construction.
D．Fire prevention.
单项选择题
A．Most are insomniacs.B．Most are teenagers.C．Most are easily cured.D．Most suffer from hypersomnia.
A．Most are insomniacs.
B．Most are teenagers.
C．Most are easily cured.
D．Most suffer from hypersomnia.
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