单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．Driving a car.
B．Taking a taxi.
C．Taking a train.
D．Going by subway.
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单项选择题
According to World Health Organization, how many people are killed by outdoor air pollution
A．3 million
B．1.6 million
C．2.1 million
D．3.2 million
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