当钢中含碳量在0.8%以下时，随着含碳量升高，碳素钢的（）。A、强度不变,塑性降低

根据短文内容选择最佳选项。

     My full name is Tomasz P. Szynalski, but you can call me Tom. I live in Poland. I started learning

English when I was six years old in primary school. I was always one of the best students in class. But

my English was still very bad.

     In 1993, I went to high school. It is the best high school in my city. A lot of classes are taught in

English. I took the advice of my English teacher. I bought a good Polish-English dictionary. I started to

study American pronunciation. I watched American TV and movies. So I was getting better and better at

understanding spoken English. I also learnt some words and phrases (短语) that I could use in my own

sentences. In class, I would like to talk to the American teacher. When I spoke, I used simple grammar

to avoid (避免) mistakes.

     During the summer vacation of 1994, I started reading books in English. But I realized I needed a

way to have a larger vocabulary. Then I began to use a computer program to learn English words. The

program was called Super Memo. Because of all the reading and Super Memo, my vocabulary was no

longer my weakness. Then I started writing e-mails and talk only in English with some of my friends.

     Today, English is my "second native language". When I speak, I sound very much like an American.

Sometimes even Americans can't tell the difference.

1. When did the writer begin to learn American pronunciation?

A. When he was 6 years old.

B. When he was in high school.

C. After he moved to America.

D. Before 1993.

2. Which way is NOT mentioned in English learning in the passage?

A. Reading books in English.

B. Using a Polish-English dictionary.

C. Going to a language school in America.

D. Using a computer program.

3. What can we know from the passage?

A. Tom's English is pretty good today.

B. Tom didn't study English hard in primary school.

C. Tom didn't like his English teachers in high school.

D. Tom thinks good spoken English is the most important.

4. What does the underlined word "weakness" mean in Chinese?

A. 偏好

B. 弱点

C. 隐私

D. 避讳

5. Which is the best title for this passage?

A. How I Love English

B. How I Got Interested in English

C. How Important English Is

D. How I Learnt English

“肺门舞蹈”征主要见于（）

A.室间隔缺损

B.房间隔缺损

C.动脉导管未闭

D.法洛四联症

E.艾森门格综合征

当锅炉设备由于内部或外部原因发生事故，必须立刻停止锅炉运行时，称（）停炉。

常听音乐有益于身体健康。

160km/h及以下区段，对单开道岔定位支柱应位于道岔起点轨缝至线间距（）。

A、690mm

B、700mm

C、745mm

D、835mm