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在稀缺的世界中，做出任何决定实际上都会使我们失去了做其他事的机会。失去的选择就被称为机会成本。()
提示:爱丽丝的妈妈病了，爱丽丝想向老师格林先生请几天假。
Alice： Excuse me, Mr. Green. 15 d like to take a few days off.
Green：___51___ ？
Alice： My mother is ill. I have to take care of her.
Green：Oh dear! I am sorry to hear that ___52___ ？
Alice： No, thank you. My mother has caught a bad cold. She has a high fever and coughs day and night. The doctor says my mother has to be in hospital for a few days. I would like to be with her.
Green：I understand___53___？
Alice：I hope to be back next Wednesday.
Green：That？ s all right.___54___ .
Alice：Thank you,Mr. Green. That, s very kind of you. I will write it immediately.
Green：___55___ .
人们在经济衰退时比在经济繁荣时更喜欢黄金。()
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