单项选择题

As a result of over-development of tourism, Venice ______.

A．is overcrowded with cars
B．is overloaded
C．is worn away
D．is badly polluted
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单项选择题
A．similarB．criticalC．seriousD．crucial
A．similar
B．critical
C．serious
D．crucial
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A．systemB．shockC．deviceD．operation
A．system
B．shock
C．device
D．operation
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