问题
单项选择题
Stations are grouped by countries arranged in the（）order of their country symbols.
A.alphabetical
B.figure
C.name of stations
D.series
答案
参考答案：A
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Stations are grouped by countries arranged in the（）order of their country symbols.
A.alphabetical
B.figure
C.name of stations
D.series
参考答案：A