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第1题
A.The solution to the Nebraskan settlers' fuel problem.
B.Life in Nebraska in the late nineteenth century.
C.The importance of the American buffalo.
D.The forestation in Nebraska in the late nineteenth century.
第2题
A.Nebraska was not a densely -forested state even before the settlers arrived.
B.The children enjoyed collecting the buffalo chips.
C.The children spent a lot of time collecting the chips.
D.Buffalo chips were satisfactory as a fuel.
第3题
A.About 33 percent.
B.About 1 percent.
C.About 66 percent.
D.About 3 percent.
第4题
A.in greater amounts in summer
B.only in summer
C.in greater amounts in winter
D.only in winter
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