单项选择题

A．At 9:00.
B．At 9:30.
C．At 9:25.
D．At 10:00.
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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．partly due to variations in the output of solar energy
C．possibly because the ice caps in the poles are melting
D．exclusively due to the effect of the inertia of the earth’’s climate
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