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  3. Never laugh at a snow covered mountain! Laughter and yelling, during the avalanche season, can cause a deadly pile of snow. Huge

Never laugh at a snow covered mountain! Laughter and yelling, during the avalanche season, can cause a deadly pile of snow. Huge

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问题     Never laugh at a snow covered mountain! Laughter and yelling, during the avalanche season, can cause a deadly pile of snow. Huge snow slides are most common in mountains where there are steep slopes that are well buried in snow and ice. The snow builds up slowly and lands very softly. This can create a very touchy, unstable situation. Tons of snow may be held up by only the friction between snowflakes. The deep snow is like a house of cards. The slightest movement can cause it to fall. As soon as something slips, this great mass of snow will come crashing down the mountainside.
    Slides may be started by sound vibrations. They may also be started by the weight of wet, melting snow. Once an avalanche has been triggered, the cause no longer matters. Moving down a steep slope, it picks up great speed and added snow. Some avalanches travel as fast as two hundred miles per hour. The force of an avalanche will mow down anything in its path. Whole houses have been swallowed up by these fast-paced piles of snow.
    The wind that is caused by an avalanche is almost as destructive as the snow itself. Winds from an avalanche have been known to travel as fast as those of a tornado. So, when approaching a thickly snow covered mountain , speak softly!
Avalanches can be started by______.
选项 A、falling snow
B、the wind
C、loud sounds
D、friction between snowflakes
答案C
解析 第二段。下雪本身并不能引起雪崩。最后一段说雪崩可引起风，而不是风引起雪崩。雪花之间的摩擦说明积雪不牢固。只有选项C是正确的。
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