单项选择题

The polar bear got nearer to the seal by ______.

A．sliding over the ice sheet
B．tiptoeing on the ice sheet
C．swimming under the ice sheet
D．crawling from behind the seal
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单项选择题
We learn from the passage that after the polar bear gave birth to her babies ______ before the months of night were over.
A．the bear would get out of the snow and get something for the babies to eat
B．the babies would get out of the snow and live on their own
C．the bear would stay in the snow and eat nothing
D．the babies would stay with her and eat nothing
单项选择题
The upright seals mentioned in the last paragraph were ______.
A．human beings
B．a rare kind of seal
C．seals which live on the land
D．a dangerous species living upon polar bears
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