单项选择题

With what topic is the passage mainly concerned

A．The Nebraskan terrain.
B．Early settlers.
C．Arbor Day.
D．Some uses for trees.
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单项选择题
It can be inferred from the passage that in the eastern United States there were many ______.
A．trees
B．settlers
C．types of fuel
D．situations requiring adaptation
单项选择题
The latest year for which figures could be obtained is ______.
A．the year the author wrote the article
B．1977
C．any year between 1977 and 1983
D．1983
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