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．it will 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
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单项选择题
If the assumption about the delay of a new Ice Age is correct ______.
A．the best way to overcome the cooling effect would be to burn more fuels
B．lee would soon cover the northern hemisphere
C．the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly
D．the greenhouse effect could work to the advantage of the earth
单项选择题
It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.
A．prevent the sun's rays from reaching the earth's surface
B．mean a warming up in the climate in the Arctic hemisphere
C．account for great changes in the climate in the northern hemisphere
D．raise the temperature of the earth's surface
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