单项选择题

A．Six Stages for Repairing Sam’’s Bicycle.
B．Possible Ways to Problem-solving.
C．Necessities of Problem Analysis.
D．Suggestions for Analyzing a Problem.
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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
单项选择题
A．The idea occurred to him when he went shopping yesterday.B．He got the idea when he was on his way back yesterday.C．He had the idea when he was lying in bed last night.D．He got the idea on his way to work yesterday.
A．The idea occurred to him when he went shopping yesterday.
B．He got the idea when he was on his way back yesterday.
C．He had the idea when he was lying in bed last night.
D．He got the idea on his way to work yesterday.
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