单项选择题

The article is written to illustrate _________.

A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar-weather interactions
D．the factors responsible for the global climate
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单项选择题
On the basis of the models, scientists are of the opinion that _________.
A．the climate of the world should be becoming cooler
B．it'll take thousands of years for the inertia of the earth's climate to take effect
C．the man-made warming effect helps to increase the solar effects
D．the new Ice Age will be delayed by the greenhouse effect
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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