单选题What is the most important service of trees to man according to the passage?AThey help him make money.BThey give him wood and other products.CThey help him prevent droughts and floods.DThey give him shade.
单选题
What is the most important service of trees to man according to the passage?
A
They help him make money.
B
They give him wood and other products.
C
They help him prevent droughts and floods.
D
They give him shade.
参考解析
解析：
细节题。第二段第一句“Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important”表明树木的第三种功能是最重要的，而第一段的最后列举了它的三种功能。
细节题。第二段第一句“Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important”表明树木的第三种功能是最重要的，而第一段的最后列举了它的三种功能。
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