单项选择题

A．They have a great effect on everyone’’s intelligence.
B．They have some effect on many people’’s intelligence.
C．They have some effect on a few people’’s intelligence.
D．They have no effect on most people’’s intelligence.
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单项选择题
A．Because the temperature can climb to 85° Fahrenheit.B．Because the temperature can climb to 95° Fahrenheit.C．Because the temperature can climb to 75° Fahrenheit.D．Because the temperature can climb to 105° Fahrenheit.
A．Because the temperature can climb to 85° Fahrenheit.
B．Because the temperature can climb to 95° Fahrenheit.
C．Because the temperature can climb to 75° Fahrenheit.
D．Because the temperature can climb to 105° Fahrenheit.
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
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