电线管路敷设时，CT含义为（）。A、焊接钢管 B、水煤气管 C、电缆桥架

When I was 16 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 about anyone with my problems. 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 came into the classroom. I didn't know who he was. He passed me and then turned back. He looked at me, without a word, only a smile.

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 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. I believe that the world is what you think it is. If you think it lonely, you might always be alone. So smile at the world and it will smile back.

11. Why was the smile an important gift?

A. Because the writer's old school was far away.

B. Because the writer didn't know who the boy was.

C. Because the smile didn't mean anything to the boy.

D. Because it made the writer feel happy, lively and warm.

12.The writer didn't talk to anyone in her new school about her problem because  .

A. she was always unhappy

B. she didn't have any friends there

C. she was in the first year at the junior high school

D. she didn't want her parents to worry about her

13. How did the smile change her life?

A. She started to make friends.

B. She became the best friend with the boy.

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

D. She realized that she was lonely.

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

A. From her old school     B. From her parents.

C.. From herself.          D. From her classmates at the new school.

15. Who has become the writer’s best friend now?

A. The writer herself           B. The writer’s parents

C. The writer’s classmates     D. The boy with the smile

一个自然数除以真分数，商一定大于这个自然数．______．（判断对错）

霍乱患者剧烈腹泻的致病因素是（）。

A.神经氨酸酶

B.血凝素

C.霍乱内毒素

D.菌体裂解

E.霍乱肠毒素

下面哪一项不是腹部连续硬膜外麻醉的功效（）

A.痛觉阻滞完善

B.肌肉松弛满意

C.对呼吸循环和肝肾功能影响较小

D.交感神经部分阻滞、肠管收缩、手术野显露较好

E.无内脏牵拉反应

电缆井、管道井、排烟道、排气道等竖井应分别独立设置，其井壁应采用耐火极限不低于（）h的不然性构件。

A.0.5

B.1.0

C.1.5

D.2.0