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

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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

单项选择题

The author is inclined to think that a fifth level

A．would be little better than the fourth level
B．may be a lot more satisfying level than the first four
C．can be the last and most satisfying level
D．will become attainable provided the government takes actions