单项选择题


A．ready
B．available
C．sheet
D．key
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单项选择题
According to the passage, which of the following posed the biggest obstacle to the development of military forts
A．Insufficient shelter.
B．Shortage of materials.
C．Attacks by wild animals.
D．Illness.
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 experiments different building materials.
C．By maintaining records of diseases and potential causes.
D．By monitoring the soldiers' diets.
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