【单选题】

Inflation is a period of rapid rises in prices. When your money buys fewer goods so that you get (56) for the same amount of money as before, inflation is the problem. Sometimes people describe inflation as a time when "a dollar is not (57) a dollar anymore".

Inflation is a problem for all consumers, especially people who live on a fixed income. Retired people, for instance, cannot (58) on an increase in income as prices rise. They face serious problems in stretching their incomes to (59) their needs in time of inflation. Many retired people must cut their spending to (60) rising prices. In many cases they must stop (61) some necessary items, such as food and clothing.Even (62) working people whose incomes are going up, inflation can also be a problem. The (63) of living goes up, and they must have even more money to maintain their standard of living. When incomes do not keep (64) with rising prices, living standard goes down. People may be earning the same amount of money, but they are not living (65) because they are not able to buy as many goods and services.
Government units gather information about prices in our economy and publish it as price indexes (66) the rate of price change can be determineD、A、price index measures changes in prices using the price for a (67) year as the base. The base price is set (68) 100, and the other prices are reported as a (69) of the base price.A、price index makes (70) possible to compare current price with that in previous years.
A．worth for
B．worth
C．worthy
D．worthwhile