单项选择题

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
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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
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
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