A、Measures. B、Rulers. C、Money. D、A medium of exchange. C录音原文提到The confusion arises…all material goods and services．由于货币是衡量所有商品和服

Money means different things to different people. We have all heard or used expressions such as, "How much money do you want for this? How much money do you make?" and "They have a lot of money. " It is obvious that money does not mean the same thing in each of these expressions. In the first expression, money refers to a price; in the second, to income; and in the third, to wealth. The confusion arises because money is the standard in terms of which we value all material goods and services. For most of us, both income and wealth are considerably greater than our holdings of money. Income is the net revenue we receive for the sale of our services or of the products of our services. Wealth is the accumulation of past savings of income. Most of us hold only a small part of our wealth in the form of money.
24. Which is the best answer to the question "How much money do you want for this?"
25. What is used as the standard to value all material goods and services?
26. What may be greater than our holdings of money?
27. What is wealth?