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

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单项选择题A．The woman is upset because she didn’t pass the examination.B．The woman doesn’t hope for a promotion ....C．The man gets used to counting on the woman.D．The man thinks that the women should be promoted.

A．The woman is upset because she didn’t pass the examination.
B．The woman doesn’t hope for a promotion ....
C．The man gets used to counting on the woman.
D．The man thinks that the women should be promoted.

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

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

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