饲料报酬、饲料效率等综合指标可以用于饲料营养价值的评定，一下关于综合指标的说法错误的是（）
A. 饲料报酬又叫作料肉比（FCR），FCR=（增重（产蛋量）（kg））/（饲料采食量（kg））
B. 猪的FCR值在3：1一下时为好，家禽的FCR值在2.5：1一下为好
C. 饲料效率（Feed conversion efficiency）=（增长量（产蛋量）（kg））/（采食量（kg））
D. 饲料效率与饲料报酬所反应的都是饲料对生长（产）性能的影响
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Goods with many close substitutes tend to have（）
A. less elastic demands
B. more elastic demands
C. price elasticities of demand that are unit elastic
D. income elasticities of demand that are negative
Adam Smith suggested that an invisible had guides market economies. In this analogy, what is the baton that the invisible hand uses to conduct the economic orchestra（）
A. the government
B. prices
C. subsidies
D. the Federal Reserve
If two goods are substitutes, their cross-price elasticity will be（）
A. negative
B. zero
C. positive
D. equal to the difference between the income elasticities of demand for the two goods
If the government wants to reduce smoking, it should impose a tax on（）
A. buyers of cigarettes
B. sellers of cigarettes
C. whichever side of the market is less elastic
D. either buyers or sellers of cigarettes
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