题目内容

Men tend to put on weight in middel age.

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I was encouraged by our president.

No evidence has been produced that this would be likely to yield any enhancement in the governance of risk in major institutions.

理性经济人不是经济学的基本假定。

A. 对
B. 错

稀缺性的产生原因是（）

A. 数量的有限性
B. 人类获取有用物品的能力有限性
C. 人口迅速膨胀，人口规模的扩大导致人均资源越来越少
D. 人的欲望具有无限膨胀性