写出系数矩阵为1221，且解为xy=11的一个线性方程组是______．

阅读理解。

     Russian figure skating (花样滑冰) star Evgeni  Plushenko sent a message loud and clear at the

Turin Winter Olympics (都灵冬奥会) in 2006.

     He didn't say a word,but the message was clear in the numbers. He finished with a score of 167.67

points in the free skate and 258. 33 overall (全部的)-a surprising 27.12 points ahead of the silver

medalist. Four years ago,19-year-old Plushenko lost to his teammate and took the silver medal at the

2002 0lympics. This time, the three-time world champion took his first Olympic gold medal home.

 "This  game is mine, for  no  doubt (毫无疑问)," Plushenko said after the event. "It was my dream

when I was 4, I saw a competition and said to my mom,' I have to be there.'I said that I wanted to be

an Olympic champion. Now I have all the titles (头衔) and I am really very happy."

      At the age of 11, Plushenko was sent to his current coach (现任教练) Since his family was very

poor,his mother went to work with the coach.Luckily, the coach was a very kind person. He paid for

their apartment and gave young Plushenko food and   money."He is a very good coach and a very nice

person, "Plushenko said. "Without him, I would be nothing."

1. Plushenko won the silver medal at the 2002 0lympics when he was ______.

A. 14 years old  

B. 19 years old

C. 16 years old  

D. 20 years old

2. When Plushenko was 4 years old, he wanted to be______.

A. a player   

B. a teacher

C. an Olympic champion

D. a singer

3. Plushenko won ______ in 2006.     

A. the silver medal 

B. the gold medal

C. the second place

D. the third place

4. Plushenko was ______ when he was a child.

A. sad          

B. foolish

C. rich            

D. poor

5. ______  helped Plushenko a lot.

A. His mother          

B. His coach

C. His father

D. His friend

一节干电池的电压为______伏．家用电器之间是______连接（选填“并联”或“串联”）．标有“220V 1200W”字样的家用电器正常工作0.5小时，家中电能表的示数将变化0.6______（填单位）．

臭氧发生器产生的臭氧可用的保存方式为（）

A.塑料容器

B.金属容器

C.玻璃容器

D.搪瓷容器

E.以上容器均不能保存

在信息系统开发方法中，不属于结构化方法指导思想的是（）。

A.面向用户，进行可行性论证

B.强调系统观点，自底向上进行分析

C.分阶段工作，强调各阶段有规范完整的文档

D.充分估计变化因素，强调模块化结构

在采区巷道行走通过弯道、交岔口、风门等处时，应“一停、二看、三通过”，随时注意来往车辆。