12是6的倍数，18也是6的倍数，那么12和18的和是6的倍数吗？

请用规定的符号修改下面一段文字（至少修改5处，不得超过7处）。（5分）

（1）换用号：（2）增补号：（3）删除号：（4）调位号：                      

我们这册语文课本的内容真是丰富多彩，五彩缤纷。既有一课课精彩而富有意义的课文，还有几幅与课文相应的插图。画面的映称，文字的搭配，确实叫人看了不觉得单调。每个单元都有一个主题，选录了许多著名的国内和国外的名著，能提高我们的写作水平和我们的知识面。此外，每册书还按排了语文实践活动，可以从中使我们学到课外丰富的知识，增强我们的实践能力。

对于健康教育与“卫生宣教”的主要区别，说法正确的是（）

A.健康教育是简单的信息传播

B.卫生宣教融合了多学科的知识

C.卫生宣教已初步形成自己的理论和方法

D.健康教育具备独立的理论和方法体系

E.健康教育是作为一种辅助方法为卫生工作某一事件的中心任务服务

      "Everything happens for the best," my mother said whenever I was disappointed. "Don't worry. One

day your luck will change."

      I didn't pay attention to her words. After finishing my college education, I decided to look for a job

in a radio station. I wanted to host a sports programme. I went to Chicago and knocked on the door of

every station. But I got turned down every time.

     In one station, a kind lady said to me that I hadn’t got enough experience. "Get to a small station and

work for some time," she said.

     When I went back home, my dad told me that a businessman had opened a store and needed someone to help him. But again, I didn't get the job.

     I felt really down. "Your luck will change," Mum said to me. Later, I tried another radio station in Iowa. But the owner, a nice man, told me he had already had someone to work for him. As I left his office, I

asked, "How can someone be a sports announcer (播音员) if he can't get a job in a radio station?"

     I was waiting for the lift when I heard the man call, "What did you mean? Do you know anything about football?" He let me sit in front of a microphone and asked me to try to imagine that I was giving my

opinion on a football game, and finally I succeeded.

     On my way home, Mum's words came back to me, "One day your luck will change, Son."

1. What was the writer's ideal（理想的）job?

A. A sportsman.                          

B. A shop assistant.        

C. A sports announcer.                      

D. A businessman.

2. Why didn't the writer get the job in Chicago?  

A. Because he was too young.

B. Because he didn't get a college education.

C. Because he was not a good-looking person.    

D. Because he hadn't got enough experience.

3. The sentence "I got turned down every time" means "           ".

A. I was refused every time            

B. I was successful every time

C. I lost my way every time            

D. The door of every station was closed

4. The writer got a job             in the end.    

A. in Chicago                          

B. in his home town

C. in a college                            

D. in Iowa

2000年12月3日，山西省某煤矿发生特大瓦斯爆炸，事故造成多人死亡，经济损失惨重，事后调查表明，矿井主扇长时间不开，井下处于无风状况，造成瓦斯积聚爆炸。调查人员在爆炸地点不远处发现打火机和烟头。经分析认定，爆炸的直接原因是井下矿工吸烟。上述事故说明()

A.偶然事故在所难免 

B.责任重于泰山 

C.职业道德不重要，关键是提高职业技能 

D.违反劳动纪律的行为损人害己

高某欲出卖自己多年饲养的一条狗，高某告知买受人秦某狗易咬伤人的事实，但秦某仍表示愿意购买，于是高某要求秦某将狗送回家后三个月内付款。二人约定，在秦某没有付款之前。高某将保留狗的所有权。秦某将狗运回家后不久，该狗挣断铁链逃脱，被孙某拾得。在孙某一个多月的饲养过程中，有人间及该狗是谁家的时候，孙某都回答说是暂时替他人保管的。某日，孙某将狗放到外面，将行人周某咬伤。孙某觉得此狗不易驯服，便将狗出卖给陈某，但没有指出狗经常咬人的事实，不料狗又咬伤了不少人，为此，陈某要求孙某退还价款，返还狗给孙某。 问：(1)本案涉及哪些民事法律关系 (2)周某被咬伤的责任应当由谁承担为什么 (3)如何认定孙某将狗出卖给陈某行为的性质陈某能否取得狗的所有权为什么 (4)陈某要求返还价款的主张能否成立为什么