单项选择题

London taxi drivers are very efficient________.

A．because they have a driving license
B．because they have received special training
C．because the traffic conditions in London are good
D．because the traffic system of the city is not very complex
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单项选择题
About ________cars and dogs are destroyed each year.
A．6 million
B．15 million
C．30 million
D．1 million
单项选择题
The woman objects to living on campus ________
A．because it costs too much
B．because there are too many freshmen
C．because the rooms are too small
D．because it’’s too noisy
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