What is the main topic of this passage? According to the passage, how much of the originally forested are remained in Nebraska

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问题 What is the main topic of this passage?
According to the passage, how much of the originally forested are remained in Nebraska by 1880?

选项 A、About 33 percent.
B、About 1 percent.
C、About 66 percent.
D、About 3 percent.

答案A

解析 参阅第一段第二句"... only about one -third of ... remained",即约33%。
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