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
Paragraph 3 points out that the Lakes ______.
A．have too many boats on them
B．are overcrowded on the beaches
C．are polluted by wastes
D．are no longer attractive
单项选择题
Which of the following statements best summarizes the main idea of the passage
A．The development of tourism has brought about environmental problems.
B．Tourism should not develop at the cost of the environmental destruction.
C．Measures taken to protect the environment prove to be ineffective.
D．Tourism is developing for the sole purpose of making money.
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