According to the passage, trees are useful to man mainly in three ways, the most

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问题 According to the passage, trees are useful to man mainly in three ways, the most important of which is that they can ______ [br] Sooner or later the forests will disappear ______

选项 A、if people don’t stop cutting trees
B、unless a country has a plenty supply of trees
C、unless all people the importance of planting trees and the government has good system of control.
D、if man doesn’t stop cutting trees carelessly

答案 C

解析 本题考查的也是考生对细节的把握,答案对应于文章第四段最后一句。
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