问题 单项选择题

下列对人体某些生理过程的叙述,正确的是()。

A.一个人在冬季或夏季均能维持体温的相对恒定,是因为冬季比夏季产热多、散热少

B.所谓内环境的稳态是指在正常情况下,内环境的各项理化性质能保持不变

C.如果下丘脑严重受损,则人体很难维持自身的体温恒定

D.当血钾含量降低或血钠含量升高时,醛固酮的分泌量会增加

答案

参考答案:C

解析:

一个人体温的相对稳定是因为机体的产热量与散热量能够维持相对平衡的结果,冬季环境温度低,机体散热多,因此产热多,夏季环境温度高,机体散热少,因此产热少,同一个人在冬季和夏季的散热量比,冬季多,A项错误;内环境的稳态是指在正常情况下,内环境的各项理化性质能保持相对稳定,B项错误;人的体温调节中枢在下丘脑,因而下丘脑受损将导致体温调节的异常,C项正确;当血钾含量降低或血钠含量升高时,醛固酮的分泌量会减少,D项错误。

阅读理解

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 essential in speaking English well.

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

whatever you like! Read papers and visit Internet sites that you like in English every day. Gradually, 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 advisable 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 that it is very good to visit some English-speaking country to see and test your

knowledge in everyday life. You will feel the everyday usage of the language in its natural environment.

There your level of English is going to improve even faster. Your 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. Practice, practice! Read, write and improve your language skills and you are on your way when you will be able to speak it with more and more

confidence! Let it be fun and entertaining!

1. According to the text, what may make the author excited?

A. Reading papers and visiting Internet sites.        

B. Having a good basis of English.

C. Going to an English-speaking country.    

D. A native speaker's praise.

2. What does the author suggest doing about reading?

A. Trying to enlarge 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 author's eyes, the essential way to improve your speaking skill is      .

A. practicing  

B. going abroad

C. reading  

D. writing

4. What does speaking English have common with playing the piano?

A. Both need much practice.          

B. Both are fun and entertaining.

C. Both need great confidence.        

D. Both need good teachers.

5. Which of the following could be the best title of the text?

A. How to improve your language skills

B. How to speak English well

C. Speaking English      

D. Practice, practice!

单项选择题