单项选择题

The article was written to explain______.
A) the greenhouse effect C) the greenhouse effect
B) the solar effects on the earth D) the causes affecting weather

A．The article was written to explain______.
B．the greenhouse effect
C．the solar effects on the earth
D．the greenhouse effect
E．the causes affecting weather
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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 postponed by the greenhouse effect
C．the warming effect helps to increase the solar effects
D．inertia of the earth's climate to take effect in thousands of years
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 inenia of the earth's climate
D．partly due to variations in the output of solar energy
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