统计的作用包括（）。
A.A
B.B
C.C
D.D
E.E
参考答案：A, C, D
—When is your birthday?
—______ [ ]
A. I was born in 1994.
B. I was born in Shanghai.
C. It's on 8th August.
D. I have a birthday party every year.
个性结构理论认为哪几部分保持平衡状态有利于人格正常发展（）
A.本我、自我和超我
B.本我、自我和现实
C.自我和现实
D.本我和自我
E.本我和超我
