单项选择题

A．It’’s down the hall and to the right.
B．It’’s up the hall and to the right.
C．It’’s down the hall and to the left.
D．It’’s up the hall and to the left.
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单项选择题
It can be concluded that a concentration of carbon dioxide in the atmosphere would______.
A．mean a warming up in the Arctic
B．raise the temperature of the earth’’s surface
C．prevent the sun’’s rays from reaching the earth’’s surface
D．account for great changes in the climate in the northern hemisphere
填空题
arsenal
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