单项选择题

According to the article, what is one of the results of rising temperatures at Hudson Bay

A．Polar bears have become extinct.
B．Polar bears have less of an appetite.
C．A reduced amount of time for polar bears to feed.
D．The changes are startling and unexpected.

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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

By saying Spring is usually prime food time for 1,200 polar bears (Line I, 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