生产安全事故应急管理的第一原则是（）

阅读下面短文，从各小题所给的四个选项中选出能够回答所提问题或完成所给句子的最佳答案。

       Is bicycling hard to learn? Different people have many different answers. It is strange enough that the

same person may also have a different answer as time goes by.

       Five years ago when l was in Junior Grade One, I got interested in bicycling because I thought my

uncle was very cool when he rode his bike. He could ride a bike with only one wheel. He could also sit

on the bike and keep it standing straight, without moving for a long time.

       I thought it was easy to learn to ride a bike, so I decided to learn from my uncle.  He told me how to

ride. When I fell off the bike the first time,1 was afraid to try again.  It was too hard for me to learn.

       Then my uncle helped me by holding the bike for me and not to let go. With his help,I was able to

ride longer and longer.  "You can do it by yourself now, young boy!"I heard his voice far behind me.

1. At first, the writer thought it was____ to ride a bike.      

A. easy    

B. different    

C. necessary    

D. important

2. According to this passage,____ is good at bicycling.

A. the writer's father    

B. the writer's brother

C. the writer's uncle    

D. the writer's P. E. teacher

3. The writer learned to ride a bike____.

A. when he was in Junior Grade One    

B. when he was five years old

C. in 2004    

D. when he bought a new bike

4. Which of the following is RIGHT?

A. The writer was always brave when riding a bike.

B. Some people think bicycling is easy.

C. The writer found it easy to ride a bike all the time.

D. The writer's uncle wasn't much good at bicycling.

5. What's the passage about?

A. Bicycling is interesting.    

B. Bicycling is dangerous.

C. Is bicycling easy or hard?    

D. Is bicycling good or bad?

钟面上1时5分时，时针和分针的夹角是0゜．______．（判断对错）

在左侧位心后间隙消失，提示（）。

A.左心室增大

B.右心室增大

C.左心房增大

D.右心房增大

E.以上都不是

什么叫抗劲？

按三度四分法，浅二度烧伤创面愈合时间为伤后（）

A.3～5天

B.1～2周

C.3～4周

D.5～6周

E.6周后