单项选择题


A．facts
B．figures
C．persons
D．statistics
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单项选择题
A．OnB．WithC．InD．For
A．On
B．With
C．In
D．For
单项选择题
Which of the following statements best expresses the main idea of the passage
A．By the nineteenth century, forts were no longer used by the military.
B．Surgeons at forts could not prevent outbreaks of disease.
C．Forts were important to the development of the American West.
D．Life in nineteenth-century forts was very rough.
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