单项选择题

The article was written to explain ______.

A．the greenhouse effect
B．the models of solar-weather interactions
C．the solar effects on earth
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．possibly because the ice caps in the poles are melting
C．exclusively due to the effect of the inertia of the earth's climate
D．partly due to variations in the output of solar energy
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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