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【参考答案】

D
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单项选择题
A．The heavy traffic in the city.B．The pollution in the city.C．The inefficiency of public transport.D．The high car park cost.
A．The heavy traffic in the city.
B．The pollution in the city.
C．The inefficiency of public transport.
D．The high car park cost.
单项选择题
A．Doing physical exercises.B．Drinking alcohol.C．Eating high-fat foods.D．Smoking.
A．Doing physical exercises.
B．Drinking alcohol.
C．Eating high-fat foods.
D．Smoking.
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