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問題詳情：完形填空。;閲讀下面短文，掌握其大意，然後從各小題所給的四個選項中選出最佳選項。Americanpeoplehavethehabitofsaying“Thankyou”whensomethingkindisdoneforthemorsomethingpoliteissaidtothem,nomatterhow...