单项选择题


Passage Two
Questions 19 to 21 are based on the passage you have just heard.

A．Grain growers.
B．Operators of rural passenger shipping business.
C．Taxi drivers.
D．None of the above.
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单项选择题
A．To stop using fossil fuels.B．To reduce carbon dioxide emissions.C．To move to colder places.D．None of the above.
A．To stop using fossil fuels.
B．To reduce carbon dioxide emissions.
C．To move to colder places.
D．None of the above.
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