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
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
单项选择题
It can be concluded that a concentration of carbon dioxide in the atmosphere would______.
A．mean a warming up in the Arctic
B．raise the temperature of the earth's surface
C．prevent the sun's rays from reaching the earth's surface
D．account for great changes in the climate in the northern hemisphere
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