单项选择题

在本节中,你将听到15个对话,每个对话有一个问题,请从[A],[B],[C]三个选项中选出答案,并标在试卷的相应位置。每段对话后有15秒钟的停顿,以便回答问题和阅读下一问题及其选项。每段对话读两遍。 How many kilometers by train is it from Guangzhou to Shanghai

A. About 2300 km.
B. About 1800 km.
C. About 2800 km.
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People are all here during workday.