Virtually all plant and animal species on Earth can be found in tropical rainfor

游客2024-06-15  15

问题 Virtually all plant and animal species on Earth can be found in tropical rainforests. [br] New tree seedlings will not survive to reach the canopy level unless

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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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