单项选择题


A．facts
B．figures
C．persons
D．statistics
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单项选择题
A．readyB．availableC．sheetD．key
A．ready
B．available
C．sheet
D．key
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.
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