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
Each winter holidaymakers in the mountains come face to face with death because ________.
A．they fail to realize how dangerous avalanches can be
B．they are not expert enough at skiing on the fixed runs
C．they are trying to avoid where avalanches happen
D．they ski great distances down the mountainsides
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