单项选择题

The article was written to explain______.

A．the greenhouse effect
B．the solar effects on the earth
C．the models of solar weather interactions
D．the causes affecting weather
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单项选择题
If the assumption about the delay of a new Ice Age is correct,______.
A．ice would soon cover*the northern hemisphere
B．the greenhouse effect could work to the advantage of the earth
C．the best way to overcome the cooling effect would be to burn more fuels
D．the increased levels of carbon dioxide in the atmosphere could warm up the earth even more quickly
单项选择题
We'll miss him when he leaves the company, but no one's______.
A．inaccessible
B．irreversible
C．immovable
D．irreplaceable
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