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Why does land become desert after all trees are cut down? 查看材料

  • A.Because nothing remains on land except floods.
  • B.Because there are no longer trees to keep the rain and protect the top-soil.
  • C.Because too much rain sinks in and washes away the top-soil.
  • D.Because roots of the trees break up the soil.
试题出自试卷《2015年成人高考学士学位英语最后冲刺试题(1)》
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