题目内容

你的姑妈正考虑开一家五金店，为此她辞去了年薪为５万元的会计师工作。经她计算，店面租金、购进货物和支付工人工资每年共需要５０万元。（１）给机会成本下定义。（２）你姑妈经营五金店一年的机会成本是多少？（３）如果估算她一年的营业额可以达到５４万元，她应该开这个店吗？解释原因。

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在我国，许多大商场和超市晚上仍开门营业，给白天工作繁忙的市民购物带来极大的方便。但是，我们很少见到银行把工作时间延长到晚上。对此有市民在报纸上刊文批评，但仍没有见到情况有所改善。试运用边际思维解释这一现象。

What is the meaning of "Friendship in its usual sense is not tested by the strain of daily, yearlong cohabitation"?[音频]

A. Friendship does not need to be tested.
B. Friendship is not usually judged by whether two people are living together.
C. It is not easy for two people who have been living together for years to develop a strong friendship.

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Which of the following things must one NOT do if one is to develop frienship with his or her partner?

A. Try to interest each other.
B. Spend the maximum amount of time together.
C. Spend some time separately and develop different intersts.

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Which of the following should NOT exist in an industrial society?

A. Universal education.
Birth control.
C. Gender discrimination.

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