Felty综合征是指类风湿性关节炎伴有A．肾炎B．心肌炎C．肺间质纤维化D．淀粉样变

阅读理解。

     When I was 13 years old, a boy gave me an important gift. It was a smile.

     It was the early autumn of my first year at a junior high school, and my old school was far away. As a

result, no one knew who I was. I was very lonely, and afraid to make friends with anyone.

     Every time I heard the other students talking and laughing, I felt my heart break. I couldn't talk to

anyone about my problem, and I didn't want my parents to worry about me.

     Then one day, my classmates talked happily with their friends, but I sat at my desk unhappily as usual.

At that moment, a boy entered the classroom. I didn't know who he was. He passed me and then turned

back. He looked at me and, without a word, smiled.

     Suddenly, I felt the touch of something bright and friendly. It made me feel happy, lively and warm.

     That smile changed my life. I started to talk with the other students and made friends. Day by day, I

became closer to everyone in my class. The boy with the lucky smile has become my best friend now.

     One day, I asked him why he smiled, but he couldn't remember smiling at me!

It doesn't matter because all the dark days have gone. Now I believe that the world is what you think it is.

If you think you are lonely, you might always be alone. So smile at the world and it will smile back.

1. Why was the smile an important gift?

A. The writer's old school was far away.

B. It made the writer feel happy, lively and warm.

C. The writer didn't know who the boy was.

D. The smile didn't mean anything to the writer.

2. Why do you think the boy smiled?

A. He was happy to see his friends.

B. He saw the writer was unhappy.

C. He really liked the writer.

D. He was a very friendly boy and smiled at everyone.

3. How did the smile change her life?

A. She began to make new friends.

B. She became best friends with the boy.

C. Her parents didn't worry about her any more.

D. She realized that it's important to smile at people.

4. Where does she now think her feeling of unhappiness came from?

A. From her old school.

B. From herself.

C. From other people in the world.

D. From the children at the new school.

简单故障中（）故障占绝对多数。

辐射校正包括三部分的内容：（）、（）和（）。

系统发生单相接地时，应（）和（）的运行情况。

初生结构