组织透明剂必须具有（）。 A.可与95%乙醇和福尔马林二者混合 B.可与50%乙醇和

It is not rare in ________ that people in ________ fifties are going to university for further education.[ ]

A. 90s; the  

B. the 90s; /

C. 90s; their  

D. the 90s; their

马拉硫磷在动物体内主要由下列何种酶代谢转化（）

A.羧酸酯酶

B.微粒体混合动能氧化酶

C.胆碱酯酶

D.乳酸脱氢酶

E.以上都不是

人类起源于：（ ）

A．黑猩猩

B．森林古猿

C．古人类

D．现代类人猿

阅读理解。

     Nowadays everybody seems to think that they know English. Many people speak it but few speak it really

well. Practice is necessary in speaking English well.

     Reading is also one of the things that will help you to speak English better. Read whenever you can and

whatever you like! Read papers and Internet sites that you like in English every day. Then, you will see that the

number of known words is increasing and you are able to speak with more skills. Then you will have made the

foundations (基础) and a good basis of English. It is not good to stop and get stuck there.

     Going to England or an English-speaking country is a good choice, but many people cannot afford it. If

you cannot go, reading and speaking with your friends will also help you to practice your English. However, I

think it is very good to visit some English - speaking country to see and test your knowledge in everyday life.

You will understand the everyday usage of the language in its natural environment. There your level of English

is going to improve even faster. You ability to speak English is better. Nothing can match the excitement and

happiness when a native speaker tells you that your English is very good!

      Finally, in order to speak English well, you must be persistent (坚持的) and do it every day. It is like

playing the piano. Pianists play it every day and so should you. Include English in your life and you will see

where it is going. Practice, practice! Read, write and improve your language skills and you are on you way

when you will be able to speak it with more and more confidence!

1. Which of the following would be the best title for the passage?

A. How to Improve Your Language Skills

B. How to Speak English Well

C. Speaking English

D. Practice, Practice!

2. What does the writer suggest about reading?

A. Trying to improve your vocabulary.

B. Keeping on reading when you have time.

C. Stopping when you have a good basis of English.

D. Looking up every unknown word when reading.

3. In the writer's eyes, the essential way to improve your speaking skills is _____.

A. practicing

B. going abroad

C. reading

D. writing

4. The main idea of the last paragraph is that ______.

A. we should play the piano every day

B. speaking English is fun and entertaining

C. we should practice English every day to improve our speaking skills

D. if we've learned to read and write, we'll certainly be able to speak

5. According to the passage, what may make the author excited?

A. Reading papers and Internet sites.

B. Having a good basis of English.

C. Going to an English - speaking country.

D. A native speaker's praise.

不是受剪承载力的计算位置为下列哪项（）。

A.支座边缘

B.受拉区弯起钢筋弯起点处

C.箍筋面积或间距改变处

D.跨中截面