单项选择题
A．带有很多优点的电子计算机不能完成代替人类完成创新工作。 B．虽然电子计算机有很多优点，但它们不能进行创造性的工作，也代替不了人。 C．许多先进的电子计算机不再按照人的意志工作并最终能代替人。 D．电子计算机还不能有效地完成人类交给他的创造性工作。
A．services enjoyed by all people B．what we can buy and sell in public C．products that we make for national defense D．taxes paid by the people involved
A．ensure the continuous supply, of public goods B．reduce the difference between the rich and the poor C．get extra money to support public goods D．remind people of their duty