单项选择题


A．However
B．In addition
C．By contrast
D．Therefore
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单项选择题
A．NorB．NeitherC．SoD．Also
A．Nor
B．Neither
C．So
D．Also
单项选择题
Many scientists hold that global warming can be controlled by ______.
A．reducing the polar bear population
B．paying more attention to the earth's rising temperatures
C．reducing carbon dioxide emissions
D．refreezing the polar ice caps
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