单项选择题

From the passage we can infer that real happiness of life belongs to ______.

A．workers and employers
B．higher up in their social status
C．better fellow-competitors
D．those who could keep far away from this competitive world
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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
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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