摘要:英文文本 Too high a price? Listen to the tape then answer the question below. What does the writer describe as an 'amusing old-fashioned source of noise'? Pollution is the price we pay for an over[阅读全文]

摘要:Relative price is the price of a commodity such as a good or service in terms of another; ie, the ratio of two prices. A relative price may be expressed in terms of a ratio between any two prices or t[阅读全文]