Paragraph 4_______A.The invention of the fridge.B
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Paragraph 4_______
A.The invention of the fridge.
B.The pollution caused by fridges.
C.The widespread need for fridge.
D.The days without the fridge.
E.The waste of energy caused by fridges.
F. The fridge’s contribution to commerce.
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答案：F
段首句是观点句，该句说“冰箱促进了市场梢售“，而“marketing（市场销售）”这个词也是在段落中反复出现，因此判断选项中应该出现与该词相呼应的词或内容，因此判断F项commerce (贸易）与marketing( 销售）呼应，是答案。