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
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
Which of the following is the most likely inference about the decision to promote gardening at forts
A．It was expensive to import produce from far away.
B．Food brought in from outside was often spoiled.
C．Gardening was a way to occupy otherwise idle soldiers.'
D．The soil near the forts was very fertile.
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