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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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

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