单项选择题

A．prevent the sun's rays from reaching the earth's surf……

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

单项选择题If the assumption about the delay of a new Ice Age is correct, _____.

A．the increased levels of carbon dioxide could warm up the earth more quickly
B．ice would soon cover the southern hemisphere
C．the best way to overcome the cooling effect would be to burn more fuels
D．the greenhouse effect could work to the advantage of the earth

单项选择题The article was written to explain______.

A．the greenhouse effect
B．the solar effects on the earth
C．the greenhouse effect
D．the causes affecting weather