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    Every spring they would plant many trees along the hillside to ________ the soil from being washed away.


    1. A.
      prevent
    2. B.
      forbid
    3. C.
      protect
    4. D.
      defending
    C
    prevent...(from)..., stop...(from)..., keep... from..., hold...back from doing... discourage...from doing...的意思是“阻止……做……；不让……干……”；forbid doing...的意思是“禁止……”；forbid sb. to do sth.的意思是“禁止某人做某事”；protect...from...的意思是“保护 ……不受……之影响；保护……不遭受……危害”；defend...against/from的意思是“保护、防止、保卫”。
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         Desertification occurs in regions close to an already existing desert.     1     The first is over-use of
    water in the area. There is not enough water in any case, and if it is not carefully used, disaster can follow. As time goes on, water shortages make farming more and more difficult. In some places, locals can
    remember local lakes and marshes which were once the homes for all kinds of fish and birds.     2    
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    bushes and trees means that the wind will blow away the soil. Once the soil is lost, it is hard to replace,
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    C. They have been completely buried by the sand now.
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    E. They destroy the land, as the soil dries out and is then blown away.
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