What is the most important service of trees to man according to the passage? What does the author tell us in this passage?

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问题 What is the most important service of trees to man according to the passage?
What does the author tell us in this passage?

选项 A、How trees help prevent droughts and floods.
B、The relationship between trees and man.
C、How an empire fell to pieces in ancient times.
D、A story of trees.

答案B

解析 本题考查的是考生对全文意思的整体把握。本文主要介绍失去森林对人类的影响,即树木与人类的关系,因此应选B。
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