A、The lines on it go in two directions. B、The spacing between stations is varying. C、The Underground did a test run of 750,000 c

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问题  

选项 A、The lines on it go in two directions.
B、The spacing between stations is varying.
C、The Underground did a test run of 750,000 copies.
D、The color of each station corresponds to that of the line.

答案D

解析
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