单项选择题

A．Three minutes.
B．Two Minutes.
C．One minutes.
D．Five minutes.
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单项选择题
A．No one can find a supermarket.B．He helps people find a supermarket here.C．He has no idea where to find a supermarket.D．His family lives in this city.
A．No one can find a supermarket.
B．He helps people find a supermarket here.
C．He has no idea where to find a supermarket.
D．His family lives in this city.
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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