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Two heart attacks in a year. It hasn’t stopped him smoking, though.（）
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You should guess what the causes for the changes in the data are.（）
What are the causes for the changes The causes for the changes include where people live, when people get married, and the number of homes that have a TV.（）
描述性观察法,包括____、____、____
现金的清查方法应采用______。现金的清查方法应采用______
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