Itwasfoundthatacountrybenefitsmorebyproducinggoodsitcanmakemostcheaplyandbuyingthosegoodsthatothercountriescanmakeatlowercoststhanbyproducingeverythingitneedswithinitsownborder.

['A.\n人们发现，一个国家只生产成本耗费最低的产品，而从其他国家出售它们用较低成本生产的产品，这比在国内生产自家所需要的一切产品要划算得多。', 'B.\n人们发现，一个国家只生产成本耗费最低的产品，而从其他国家购买它们用较低成本生产的产品，这比在国内生产自家所需要的一切产品要划算得多。', 'C.\n人们发现，一个国家只生产成本耗费较低得产品，而从其他国家购买它们用较低成本生产的产品，这比在国内生产自家所需要的一切产品要划算得多。', 'D.\n人们发现。一个国家只生产成本耗费最低的产品，而从其他国家购买它们用最低成本生产的产品，这比在国内生产自家所需要的一切产品要划算的多。']

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