举一反三
内容
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中国大学MOOC: 汉堡包和炸薯条是互补品，如果汉堡包降价，对炸薯条的需求就会增加。
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【单选题】def happy(): print("Happy birthday to you!") def happy_birthday(name): happy() print("Happy birthday, dear {}!".format(name)) happy() happy_birthday("teacher") A. Happy birthday to you! Happy birthday to you! Happy birthday, dear teacher! Happy birthday to you! B. Happy birthday to you! Happy birthday, dear teacher! Happy birthday to you! Happy birthday to you! C. Happy birthday to you! Happy birthday, dear teacher! Happy birthday, dear teacher! Happy birthday to you! D. Happy birthday to you! Happy birthday, dear teacher! Happy birthday to you!
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In real life, the stars of Happy as Larry(). A: didn’t get on B: fell in love C: are best friends
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9.麦当劳公司经营了一家卖汉堡薯条的连锁速食企业，全球有38000个门店，麦当劳的水平范围很大。
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如果一个国家的工人每小时可以生产5个汉堡包或10包炸薯条,那么没有贸易时1包炸薯条的价格是2个汉堡包。