What is the talk mainly about？A．Overland transportation in the nineteenth century.B．Histor
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What is the talk mainly about？
A．Overland transportation in the nineteenth century.
B．Historical aspects of mail delivery.
C．Vehicles currently in use by the postal service.
D．The invention of the railroad.
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正确答案：B
主旨题。题目问文章大意，故在听材料时应非常注意开头与结尾的信息，文章开头明确指出这次展览是关于邮递的发展史的，是通过观看各个时期邮政所采用的交通工具来了解当时情况。故选B。