2. 外语
  3. What is the most important function of trees? The role of trees is to ______.

What is the most important function of trees? The role of trees is to ______.

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问题 What is the most important function of trees?
The role of trees is to ______.
选项 A、loosen soil
B、keep soil in position
C、harden soil
D、both A and B
答案D
解析 本题考查的是考生的总结能力及对具体细节的理解。答案对应文章最后一段的第二句话：The results are even more serious, for where there are trees their roots break the soil up allowing the rain to sink in—and also bind the soil. 这句概括树木的作用为松弛、固定土壤。也可走捷径，从连词also看应为两个作用，故选D。
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