单项选择题

What does the passage mainly discuss

A．Western migration after the Civil War
B．The climate of the western United States
C．The raising of cattle
D．A type of wild vegetation
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单项选择题
What can be inferred by the phrase Legend has it in line 1
A．The story of the train may not be completely factual.
B．Most history books include the story of the train.
C．The driver of the train invented the story.
D．The story of the train is similar to other ones from that time period.
单项选择题
Which of the following was NOT one of the names given to the Western grasses
A．Grama grass
B．Bluejoint grass
C．Buffalo grass
D．Mesquite grass
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