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
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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