根据《消费者权益保护法》规定,消费者协会不得 ( ) 。( )
A.开展消费信息和咨询服务
B.支持消费者提出诉讼
C.从事商品经营和营利性服务
D.从事调解服务
参考答案:C
在等差数列{an}中,已知a1=-2,公差不为零,且a1,a3,a11恰好是某等比数列的前三项,则该等比数列的公比等于( )。
Which of the following statements about the elasticity of demand is least accurate()
A. The most important determinant of price elasticity of demand is the availability of substitutes.
B. Prices are more elastic in the long run than in the short run.
C. When demand is inelastic, an increase in price will cause a decrease in the total expenditure on a good.