单项选择题

According to the passage, during which period of time do the polar bears come ashore

A．January through March.
B．July through October.
C．September through December.
D．November through July.
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单项选择题
In areas where avalanches are known to happen ________.
A．local residents stay indoors when the weather is bad
B．measures are taken to prevent serious avalanches
C．small avalanches can easily be prevented
D．skiers form themselves into a wall to keep the snow in position
单项选择题
It would appear from the text that avalanches are brought about because ________.
A．a particular section of snow is not thick enough
B．there is a slight fall in the temperature
C．heavy snowfalls turn into rain
D．the ice between different sections of snow melts
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