单项选择题

We are prepared to make some _________ on minor details, but we will not compromise on fundamentals.

A．recession
B．concession
C．transmission
D．illusion
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单项选择题
In spite of the greater consumption of fuel in the northern hemisphere, temperatures seem to be falling. This is _________.
A．possibly because of the melting of the ice caps in the poles
B．mainly because the levels of carbon dioxide are rising
C．partly due to the variations of the output of solar energy
D．because the sun presents its "colder" face to the earth
单项选择题
The article is written to illustrate _________.
A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar-weather interactions
D．the factors responsible for the global climate
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