单选题 An analyst does research about characteristics of market structures. Barriers to entry of monopolistic competition are:
A. low.
B. moderate.
C. high.

【正确答案】 A
【答案解析】[解析] 垄断竞争(monopolistic competition)的市场特点如下：(1)进入壁垒低；(2)市场上有很多厂商；(3)产品有差异化；(4)企业有少量的自主定价能力。