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 on the unmarked ski slopes
D．they choose less crowded ski slopes

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热门试题

单项选择题

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

It would appear from the text that avalanches are formed 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