单项选择题

Which of the following is listed as being evidence for global warming

A．Water shortages in cities.
B．Earlier thawing of lakes and rivers.
C．Increased levels of greenhouse gases.
D．The rapid extinction of the polar bear.
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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
单项选择题
According to the text, which of the following may lead to enduring innovations in dress
A．A fad.
B．Changing tastes of the public.
C．A sudden scarcity of a particular material.
D．The passage of time.
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