单项选择题

According to the passage, trees were initially needed by the Nebraskan settlers for ______.

A．shade
B．the prevention of soil erosion
C．the creation of parks
D．construction
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单项选择题
Why does the author mention J. Sterling Morton
A．To cite an example of an early settler.
B．To give Credit for the origin of an idea.
C．To support the author's own point of view.
D．To stress the importance of journalists.
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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