潜能得不到深度开发的第一道鸿沟就是（）。
A.消极形态
B.自负心理
C.自卑感
D.缺陷
参考答案：C
Windows菜单操作中。如果某个菜单项的颜色暗淡，则表示( )。
A．只要双击．就能选中B．必须连续单击三次，才能选中C．被单击选中后，还会显示出一个方框要求操作者进一步输入信息D．在当前情况下，这项选择是没有意义的，选中它不会有任何反应
Which of the following conditions exists when the economic gain to society is maximized（）
A. The sum of consumer and producer surpluses for a good or service is maximized.
B. The difference between consumer and producer surpluses for a good or service is maximized.
C. The price and quantity for a good or service is such that consumer and producer surpluses are equal.
