单项选择题
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A.The bicycle is easily stolen.
B.The roads are narrow and unsuitable for bicycles.
C.There are many ups and downs in the city so riding a bike is tiring.
D.There are too many cars so it’’s unsafe to ride a bike.
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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.
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
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