【单选题】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
【单选题】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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