单项选择题

A．The fuel is cheap.
B．They can be stopped and reignite.
C．They are cheap to build.
D．They must be used soon after fuelin
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单项选择题
A．To encourage them.B．To stop them immediately.C．To give some explanation.D．To leave them alon
A．To encourage them.
B．To stop them immediately.
C．To give some explanation.
D．To leave them alon
填空题
What are the three ways in which mass transportation revised the social and economic fabric of the American city They are the acceleration of______.______and______.
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