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【单选题】

The role of trees is to______.
A．loose soil

B．keep soil in position
C．harden soil
D．Both A and B
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参考答案：

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根据网考网移动考试中心的统计，该试题：

1%的考友选择了A选项

5%的考友选择了B选项

10%的考友选择了C选项

84%的考友选择了D选项

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