单项选择题

The article was written to explain______.

A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar-weather interactions
D．the causes affecting weather
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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 Arctic
C．account for great changes in the climate in the northern hemisphere
D．raise the temperature of the earth's surface
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．ice 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
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