单项选择题

When it began to rain hard, I took in the doorway of a building.

A．departure
B．refuge
C．screen
D．coverage
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单项选择题
Experts used to believe that the chief reason for global wanning is _________.
A．that most fuel is consumed in the northern hemisphere
B．human activities
C．natural influences and carbon dioxide
D．the solar energy
单项选择题
If the assumption about the delay of a new Ice Age is correct _________.
A．the increased levels of carbon dioxide will warm up the earth even more quickly
B．the greenhouse effect will work to the advantage of the earth
C．the best way to overcome the cooling effect will be to burn more fuels
D．ice will soon cover the northern hemisphere
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