问题 填空题

你可能看过气功师的表演:气功师平躺在安有若干钉子的钉板上,再在钉板上放一石板,钉子却没有扎到气功师的身体内(此游戏危险,请勿模仿).这时什么道理呢?

答:这时因为钉板上的钉子很多,气功师背部承受的钉子的作用力面积较______,根据压强的定义公式p=F/s,钉子对人体背部的压强较______,所以钉子不会扎入人体内.

答案

因为钉板上的钉子很多,气功师背部承受的钉子的作用力面积较大,根据压强的定义公式p=

F
s
,当压力一定时,钉子对人体背部的压强较小,所以钉子不会扎入人体内.

故答案为:大,小.

填空题
阅读理解

阅读理解。

     Some people learn a second language easily. Other people have trouble learning a new language. How can

you help yourself learn a new language, such as English? There are several ways to make learning English a

little easier and more interesting.

     The first step is to feel positive about learning English. If you believe that you can learn, you will learn. Be

patient. You do not have to understand everything all at once. It is natural to make mistakes when you learn

something new. We can learn from our mistakes. In other words, do not worry about taking risks.

     The second step is to practice your English. For example, write a journal, or diary, every day. You will get

used to writing in English, and you will feel comfortable expressing your ideas in English. After several weeks,

you will see that your writing is improving. In addition, you must speak English every day. You can practice

with your classmates outside class. You will all make mistakes, but gradually you will become comfortable

communicating in English.

     The third step is to keep a record of your language learning. You can write this in your journal. After each

class, think about what you did. Did you answer a question correctly? Did you understand something the

teacher explained? Perhaps the lesson was difficult, but you tried to understand it. Write these accomplishments

(成就) in your journal.

     You must be positive about learning English and believe that you can do it. It is important to practice every

day and make a record of your achievements. You will enjoy learning English, and you will feel more

confidence in yourself.

1. To feel positive about learning English means _____. [ ]

A. if you are patient, you will learn

B. you can understand everything all at once

C. if you make mistakes, you can learn from your mistakes

D. if you believe you can learn, you will learn

2. When you learn English, you do not need to _____. [ ]

A. be patient

B. make mistakes

C. express your ideas in English

D. understand everything all at once

3. What is not helpful for you to enjoy learning English? [ ]

A. To communicate in English.

B. To worry about taking risks.

C. To think about what has been done after each class.

D. To make a record of the achievements.

4. What is the main idea of this passage? [ ]

A. It is very important to learn a second language.

B. Some people learn a second language easily. Other people do not.

C. There are ways to help you learn a second language more easily.

D. Don't worry about taking risks when learning a second language.