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、loose soil
B、keep soil in position
C、harden soil
D、Both A and B

答案D

解析细节题。由最后1段第2句中“for where there are trees their roots break the soil up--allowing the rain to sink in--and also bind the soil”可知，A、B项正确，故选D。

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大学英语三级B级

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