题目内容
【单选题】In general, smokers living in cities are slightly more _________ to lung cancer than smokers who are living in the country.
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【单选题】A large proportion of important _________are brought about by people who step outside of conventional categories or traditional assumptions.
【单选题】The habit of going to coffee houses was_________ by the city’s relatively small size, safe streets, good public transportation.
厂商利润最大化时，边际收益等于平均成本
注射流感疫苗，会产生正外部性
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