我国现存最早的食疗专论是《黄帝内经》。

阅读理解。

          A little boy selling magazines for school walked up to a house that people rarely visited. The

house was very old and ran down and the owner hardly ever came out. The boy's parents told him to

stay away from the house, a lot of other neighborhoods children were told the same from their parents.

          As he was ready to walk away, the door slowly opened. "What do you want?" the old man said.

 "Uh, sir, I am selling these magazines and I was wondering if you would like to buy one." The old man

stared at the boy. The boy could see inside the old man's house and saw that he had dog figurines (小雕像) on the fireplace mantle. "Do you collect dogs?" the little boy asked. "Yes, I have many collections

in my house, they are my family here. They are all I have." The boy then felt sorry for the man, as it

seemed that he was a very lonely soul. Then the old man was ready to close the door and said,"No,

boy, I don't need any magazines of any kind, now goodbye."

          The little boy was sad that he was not going to make his quota with the sale. He was also sad for

the old man being so alone in the big house. The boy went home and then had an idea. He knocked on

the door again and this time the old man came right to the door. "Boy, I thought I told you no magazines." "No, sir. But I want to give you a gift." The boy handed him the figurine and the man's face lit up. "It's a

Golden Retriever, and I have one at home, this is for you." The old man was simply stunned (受惊的);

no one had ever given him such a gift and shown him so much kindness.

         From that day on the old man started coming out of the house and acknowledging people. He

and the boy became friends. The boy even brought his dog to see the man weekly.

1. What can we see in the old man's house?

A. some magazines

B. some dogs

C. some dog figurines  

D. his family members

2. Which of the following is NOT TRUE according to the text?

A. The boy felt sorry only because he was not going to make his quota with the sale.

B. The old man regarded all the collections as his family.

C. Few people went to the old man's house.

D. The boy went to the old man's house twice.

3. The underlined word "acknowledging" means__________.

A. glaring at

B. keeping away from  

C. saying hello to  

D. refusing

4. What made the old man start coming out of the house?

A. Golden Retriever      

B. All of his dog figurines  

C. The magazine        

D. The little boy's kindness

中间宿主

材料：2011年7月19日，古城拉萨彩旗招展，雪域高原万众欢腾。西藏各族各界干部群众2万多人欢聚在布达拉宫广场，热烈庆祝西藏和平解放60周年。中 * * 、全国人大常委会、国务院、全国政协、中央军委均致电祝贺，胡 * * 题写“祝贺西藏和平解放60周年”贺匾，习 * * 出席大会并发表重要讲话。

为切实维护社会稳定，推进西藏实现跨越式发展和长治久安，我国公民首先应积极履行哪一项义务？（2分）公民在履行这一义务时应怎样做？（8分）

磁体周围一条磁感线的方向如图所示，试确定磁体的N、S极和A点处小磁针的指向．

简述食源性疾病发生的三要素？