Have you ever rubbed your hands together when they get cold? Why do we do that? We do that for friction. Friction happens when two things that aren’t very smooth rub together to make heat energy. The 题目和参考答案——青夏教育精英家教网—

题目内容

Have you ever rubbed your hands together when they get cold? Why do we do that? We do that for friction. Friction happens when two things that aren’t very smooth rub together to make heat energy. The faster you rub two things together, the more friction ( and heat) you can make. Let’s discover friction!

WHAT YOU’LL NEED

·Soap ·Water·Your hands!

WHAT TO DO

Make sure your hands are dirty.

Rub your hands together until you feel the heat of your hands.

Now, use soap and water to get your hands very slippery(滑的).

Try to make friction happen while your hands are slippery.

Please write down what has happened.

LET’S TALK!

Friction is an energy that happens when two things rub together. When friction happens, it makes heat! When your hands are slippery, they won’t make very much friction and your hands won’t get so hot.

DID YOU KNOW?

Friction happens when you stop your fast running bike.

Ancient people made fire by rubbing two pieces of wood together. Friction happened though they didn’t know it.

____?___

Friction is everywhere. Have you ever noticed situations where friction is happening? If not, ask your parents to take you out in a car. If it is not hot, touch the tires(轮胎) of the car before and after a short drive to see how much warmer they get from friction.

1. This text is most probably________________________.

A. a science report????????????? ????????????? ????????????? 　 B. a car advertisement

C. a rubbing introduction?????? D. a chemistry programme

2.What does the word “friction” in this text mean in Chinese????????

A.摩擦????????????? ????????????? B. 冷却??????? C. 膨胀????????????? ????????????? ????? D.震动

3.___________ is not an example of friction.

A. Bike riding????????????? B. Car driving??? C. Hands rubbing????????????? ? D.Friction discovering

4.What’s the last column(栏目)?

A. THINK IT OVER!????????????? ????????????? ????????????? ????????????? ?? B. WHAT HAPPENED?

C.EVERYDAY ACTION:????????????? D. WORK WITH PARENTS

【答案】

1.A

2.A

3.D???

4.D

【解析】

试题分析：短文大意：本文主要介绍有关摩擦的一些知识。摩擦是无处不在的。只不过是你注意到了没有。

1.细节理解题。通读短文可知此文是一片科学报告。所以选A。

2.词义猜测题。根据常识，人们在天冷时，常常将两手摩擦而取暖，可推知加线词是摩擦的意思，所以选A。

3.推理判断题。显然骑自行车、驾车、搓手都是摩擦的例子，但摩擦的发现并不是摩擦的例子，所以选D 。??

4.段落大意题。根据If not, ask your parents to take you out in a ca可推知最后一个栏目是：和父母合作，所以选 D。

考点：科普环保类阅读。

练习册系列答案

Air is very important to everything that lives. But the air we breathe is g【小题1】___ dirty. People all over the world are looking for w【小题2】___ to make it clean again.
Have you e【小题3】__ watched the smoke from chimneys rising high in the air? Have you s【小题4】__ the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g【小题5】___ to breathe. If we want to keep well and strong, we need to breathe c【小题6】__ air.
W【小题7】___ more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p【小题8】___.
Scientists have a【小题9】__ found ways to stop or slow down some of the things that make the air dirty. They will not stop working u【小题10】__ we have clean air again.

单词拼写（共10小题，计10分）
根据下列句子及所给单词的首字母，在答题纸上按题号写出各单词的完全形式（每空限填一词）。
【小题1】 Be careful. There is a wine b_______ on the table. You might break it.
【小题2】 The number after twenty-nine is t________.
【小题3】Have you e________ been to the Great Wall?
【小题4】It’s dangerous to d________ a car after you get drunk.
【小题5】Your parents are your f________ and mother.
【小题6】If a dream comes t________, it actually happens.
【小题7】W________ is the coldest season of the year.
【小题8】When snow f________, it comes down from the sky.
【小题9】It’s best to water plants either e________ in the morning or late at night.
【小题10】We don’t go to the c________ much for movies because we have a video.

根据短文内容及所给首字母提示写出所缺单词, 并将完整单词填在下面对应题号后的横线上。

Air is very important to everything that lives. But the air we breathe is g 1 dirty. People all over the world are looking for w 2 to make it clean again.

Have you e 3 watched the smoke from chimneys(烟囱) rising high in the air? Have you s 4 the smoke from cars and trucks on roads or the smoke from planes? The smoke is not g 5 to breathe. If we want to keep healthy and strong, we need to breathe c 6 air.

W 7 more and more factories everywhere and more and more cars, trucks and planes, it is getting harder and harder to do with the air p 8 .

Scientists have a 9 taken actions to stop or slow down some of the things that make the air dirty. They will not stop working u 10 we have clean air again.

1. 2. 3. 4. 5.

6. 7. 8. 9. 10.

根据首字母及上下文提示完成对话

A: Have you e_80___ been to Tokyo?

B: No, I have n___81__ been there before. But this summer I will go there with my parents.

A: I am s__82__ you will like it. My uncle u__83___ to work in Tokyo. But now he has g__84___to Paris for an i___85___ meeting. He will give a talk about how to p____86___ whales next week.

B: Paris? That is a really wonderful city with a very b__87_______ view.

A: R___88____? H__89___ I wish I could go there!

80____________81_____________82______________83______________84_____________

85____________86______________87_____________88______________89_____________

试题分类