Trees on the hills can stop the rains from        away the soil.


  1. A.
    to wash
  2. B.
    washed
  3. C.
    washing
  4. D.
    washes
C
解析：
考查固定用法。Stop sb from doing sth阻止某人做某事；
from是介詞，后面使用動(dòng)名詞的形式。
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C
LONDON: What could possibly be wrong with planting trees? The benefits are obvious; they  firm the soil, soak up (攝取) extra water and take carbon dioxide (二氧化碳) our of the atmosphere.
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Andy Ridgwell, an environmental scientist from the University of East Anglia, has spent the past few years studying dust and says his work “shows clearly that the complexity of the system and the importance of not tinkering(粗劣地修補(bǔ)) with it without understanding the results. For this reason the need is to focus(集中) on cutting carbon dioxide giving off rather than monkeying (瞎弄) about with the land surface.”
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