单项选择题

The author organizes the discussion of forts by ________.

A．describing their locations
B．comparing their sizes
C．explaining their damage to the environment
D．listing their contributions to western life
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单项选择题
Which of the following would a traveler be LEAST likely to obtain at Fort Laramie
A．Fresh water.
B．Food.
C．Formal clothing.
D．Lodging.
单项选择题
How did the military assist in the investigation of health problems
A．By registering annual birth and death rates.
B．By experimenting with different building materials.
C．By maintaining records of diseases and potential causes.
D．By monitoring the soldiers' diets.
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