单项选择题

A．The high altitude.
B．The unpredictable climate.
C．The extreme temperatures.
D．The wild animals.
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单项选择题
A．They’re cheaper and simpler to drive.B．They are faster.C．They cause littler air pollution.D．They have a brighter future.
A．They’re cheaper and simpler to drive.
B．They are faster.
C．They cause littler air pollution.
D．They have a brighter future.
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