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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单项选择题
What has kept temperatures from rising at an even higher rate
A．The absorption of carbon dioxide by natural factors.
B．Human effort to reduce carbon dioxide emissions.
C．Drastically reduced emissions of greenhouse gases.
D．A 10% decrease in the average weight of polar bears.
单项选择题
Why did the fourth aspect mentioned by the author play a significant role in the lives of men in Ancient Greece and Rome
A．Because political success could depend on a man's appearance.
B．Because men had a sense of fashion.
C．Because grooming was particularly important in ancient societies.
D．Because jewelry was primarily the preserve of women.
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