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    根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Snow is a subject of great interest to weather experts . 1. . One reason is that heavy amounts of snow fall in surprisingly small areas . Another reason is that a small change in temperature can mean the difference between snow and rain .

    Just what is snow , anyway ? Snow is a form of frozen water . 2. . These crystals grow from water droplets in cold clouds . They usually grow around dust particles（颗粒）. All snow crystals have six sides , but they grow in different shapes . The shape depends mainly on the temperature and water levels in the air .

    3. . About two and one-half centimeters of rain has as much water as 15 centimeters of wet snow . About 76 centimeters of dry snow equals the water in two and one-half centimeters of rain .

    Snowfall helps to protect plants and some wild animals from winter weather . Fresh snow is made largely of air trapped among the snow crystals . 4. .

    Snow can also influence the movement of sound waves . When there is fresh , soft snow on the ground , the surface of the snow absorbs , or takes in , sound waves . 5. . Then , the snow’s surface will help to send back sound waves . Under these conditions , sounds may seem clearer and may travel farther .

    A. Much of the water the world uses comes from snow .

    B. It contains groups of ice particles called snow crystals .

    C. It is difficult to predict where , when or how much snow will fall .

    D. Under some conditions , these particles may grow larger and form solid pieces of ice .

    E. Snow contains much less water than rain .

    F. However , snow can become hard and flat as it grows older or if there have been strong winds .

    G. Because the air has trouble moving , the movement of heat is limited .

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