单项选择题

A．15 minutes.
B．20 minutes.
C．10 minutes
D．25 minutes.
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单项选择题
The number of Representatives of California is more than that of Nevada because of its larger area.
A．Y
B．N
C．NG
单项选择题
Exhaled cigarette smoke is yellowish because______.
A．it comes through the mouth
B．it contains nicotine
C．of water vapour in the mouth
D．it is a good diffuse of light
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