单项选择题

Although accidents do happen, skiers will be reasonably safe if ______.

A．they stay on the officially approved slopes
B．they ski only for pleasure
C．they ski only at resorts
D．they choose less crowded ski slopes
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单项选择题
Each winter holiday makers 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 areas where avalanches happen
D．they ski great distances down the mountainsides
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
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