The mean return of a portfolio is 20% and its standard deviation is 4%. The returns are normally distributed. Which of the following statements about this distribution are least accurate The probability of receiving a return:（）

A. of less than 12% is 0.025.

B. between 12% and 28% is 0.95.

C. in excess of 16% is 0.16.

下表是我国不同时期的城市用地年平均增长率与城市人口年平均增长率统计表。据表回答下列各题。

小题1:1985—2011年我国城市人口人均城市用地总体变化趋势为

A．先增后减

B．先减后增

C．不断增加

D．逐渐减少小题2:据表并结合相关知识可以判断，1985年以来我国

A．城市新增用地以商业用地为主

B．乡村人口数量持续增长

C．城市人口增长以自然增长为主

D．农业用地面积有所减少