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
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.
单项选择题
By saying Spring is usually prime food time for 1,200 polar bears ( Line 1, Para. 1 ), the author means that ______.
A．spring is usually a good time for polar bears to carry out their mating rituals
B．the polar bears usually eat a lot in the spring
C．spring is generally a good time to hunt polar bears
D．polar bears usually hibernate in the spring
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