单项选择题

To solve the present social problems the author suggests that we should______.

A．return to primitive mode
B．take the fundamental realities for granted
C．enable man to fully develop his potentialities
D．offer higher wages to the workers and employees
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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
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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