What is the conversation mainly about？A．The relationship between farmers Ward and Sears.B
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What is the conversation mainly about？
A．The relationship between farmers, Ward and Sears.
B．The development of the catalog sales business.
C．The relationship between the catalog and textbooks.
D．The story of a Chicago retailer.
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
主旨大意题。尽管四个选项在对话中都有提及，但A、C、D只是对话的一部分，只有B可以涵盖对话中的所有内容。由order，catalog两个关键词也可推出答案是B。