单项选择题

The article was written to explain______.

A．the greenhouse effect
B．the greenhouse effect
C．the solar effects on the earth
D．the causes affecting weather
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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 could warm up the earth more quickly
B．ice would soon cover the southern hemisphere
C．the best way to overcome the cooling effect would be to burn more fuels
D．the greenhouse effect could work to the advantage of the earth
单项选择题
On the basis of their models, scientists are of the opinion that______.
A．the climate of the world should be becoming Cooler
B．the new Ice Age will be postponed by the greenhouse effect
C．the warming effect helps to increase the solar effects
D．inertia of the earth's climate to take effect in thousands of years
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