2. 外语
  3. Virtually all plant and animal species on Earth can be found in tropical rainforests. New tree seedlings will not survive to re

Virtually all plant and animal species on Earth can be found in tropical rainforests. New tree seedlings will not survive to re

admin2009-04-23  49
问题 Virtually all plant and animal species on Earth can be found in tropical rainforests.
New tree seedlings will not survive to reach the canopy level unless
选项
答案some old trees die
解析 由题干中的New tree seedlings和survive定位到第二个小标题下首段第3句New tree seedlings rarely survive to make it to the top unless some older trees die，creating a "hole" in the canopy，此处需补全条件从句。题目中的reach the canopy level和原文中的make it to the top “长到树顶端”语义相近，故原文unless后接的部分就是答案。
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大学英语六级

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