阅读理解。

     Hi, my name's Tommy. I'm in No. 10 Middle School. This is my calendar (日程表). The volleyball

game is on September 13th. The baseball game is on October 15th.My birthday is October 9th. We'll

have an English speech contest on November 20th.This year we don't have an Art Festival. But in

December we will have a school trip. That's great!

1. Tommy has a _____ on September 13th.         

A.  volleyball game                  

B.  baseball game

C.  basketball game                  

D.  tennis game

2. _____ is on October 15th.          

A.  The baseball game                

B.  It is birthday   

C.  The art festival                    

D.  The school trip

3. The English contest is on _____ .        

A.  September 3rd                  

B.  October 25th

C.  November 20th                  

D.  December lst

4. Does Tommy have an Art Festival this year?       

A. Yes, he does.                

B. No, he does.

C. Yes, he doesn't.              

D. No, he doesn't.

5.  Does Tommy like the school trip very much?        

A. Yes, he docs.                

B. No, he does.

C. Yes, he doesn't.              

D. No, he doesn't.

描述对称分布资料分布特征的指标是（）

A．均数和标准差

B．中位数和四分位数间距

C．几何均数

D．变异系数

E．极差