单项选择题

What is the main advantage of electric cars over gas-powered cars

A．They are cheaper.
B．They do not pollute as much.
C．They are simpler to drive.
D．They are faster.
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单项选择题
what is the man’s problem
A．He has a headache.
B．He failed his history exam.
C．He is tired.
D．He is too busy.
单项选择题
What is the talk mainly about
A．The problems caused by the Revolutionary War.
B．How some people became rich in the late 1700’s.
C．The importance of providing for a tax system in the Constitution.
D．Motives for creating the United States Constitution.
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