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 mountain side
70．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
71．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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    With the National College Entrance Examination drawing closer, Senior 3 students will do almost anything to ensure success–even change what they eat. More than 70 percent of high – scoring students in last year’s exam admitted taking “brain food”, according to a survey conducted by the Shanghai Hercules Teens Research Center last August. However, only 30 percent of them said they would do this again.