问题
单项选择题
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
A.countries
B.states
C.names
D.groups
答案
参考答案：C
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Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
A.countries
B.states
C.names
D.groups
参考答案：C