自然失业率（）。
A.恒为零
B.是没有摩擦性失业时的失业率
C.是没有结构性失业时的失业率
D.是经济处于潜在产出水平的失业率
参考答案：D
提出“人是唯一需要教育的动物”这一论断的教育家是（ ）
A．康德
B．柏拉图
C．夸美纽斯
D．赫尔巴特
Which of the following statements about the efficient market hypothesis is FALSE()
A. Exchange specialists derive above-average returns from private information.
B. Runs tests are used to test the weak form of the efficient markets hypothesis.
C. Efficient markets tests have found that professional money managers, as a group, have consistently outperformed the market.
