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 delayed by the greenhouse effect
C．the man-made warming effect helps to increase the solar effects
D．it will take thousands of years for the inertia of the earth's climate to take effect
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单项选择题
Although the fuel consumption is greater in the northern hemisphere, temperatures there seem to be falling. This is ______.
A．mainly because the levels of carbon dioxide are rising
B．partly due to variations in the output of solar energy
C．possibly because the ice caps in the poles are melting
D．exclusively due to the effect of the inertia of the earth's climate
单项选择题
If the assumption about the delay of a new Ice Age is correct, ______.
A．ice would soon cover the northern hemisphere
B．the greenhouse effect could work to the advantage of the earth
C．the best way to overcome the cooling effect would be to burn more fuels
D．the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly
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