单项选择题

A．They are pretty, safe and cheap.
B．They are cheap and durable.
C．They are safe, cheap and clean.
D．They are powerful, beautiful and easy to drive.
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单项选择题
A．A woman with a beard.B．A woman.C．A man.D．Not mentioned.
A．A woman with a beard.
B．A woman.
C．A man.
D．Not mentioned.
单项选择题
The passage gives a general description of the benefits and potential problems of a hydrogen economy.
A．Y
B．N
C．NG
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