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(輪胎) 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. 冷卻??????? C. 膨脹????????????? ????????????? ????? D.震動(dòng)

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(欄目)?

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】

試題分析：短文大意：本文主要介紹有關(guān)摩擦的一些知識(shí)。摩擦是無處不在的。只不過是你注意到了沒有。

1.細(xì)節(jié)理解題。通讀短文可知此文是一片科學(xué)報(bào)告。所以選A。

2.詞義猜測(cè)題。根據(jù)常識(shí)，人們?cè)谔炖鋾r(shí)，常常將兩手摩擦而取暖，可推知加線詞是摩擦的意思，所以選A。

3.推理判斷題。顯然騎自行車、駕車、搓手都是摩擦的例子，但摩擦的發(fā)現(xiàn)并不是摩擦的例子，所以選D 。??

4.段落大意題。根據(jù)If not, ask your parents to take you out in a ca可推知最后一個(gè)欄目是：和父母合作，所以選 D。

考點(diǎn)：科普環(huán)保類閱讀。

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：初中英語 來源： 題型：

根據(jù)短文內(nèi)容及所給首字母提示寫出所缺單詞, 并將完整單詞填在下面對(duì)應(yīng)題號(hào)后的橫線上。
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(煙囪) 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.        

查看答案和解析>>

科目：初中英語 來源： 題型：


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

查看答案和解析>>

科目：初中英語 來源： 題型：

單詞拼寫（共10小題，計(jì)10分）
根據(jù)下列句子及所給單詞的首字母，在答題紙上按題號(hào)寫出各單詞的完全形式（每空限填一詞）。
【小題1】 Be careful. There is a wine b_______ on the table. You might break it.
【小題2】 The number after twenty-nine is t________.
【小題3】Have you e________ been to the Great Wall?
【小題4】It’s dangerous to d________ a car after you get drunk.
【小題5】Your parents are your f________ and mother.
【小題6】If a dream comes t________, it actually happens.
【小題7】W________ is the coldest season of the year.
【小題8】When snow f________, it comes down from the sky.
【小題9】It’s best to water plants either e________ in the morning or late at night.
【小題10】We don’t go to the c________ much for movies because we have a video.

查看答案和解析>>

科目：初中英語 來源：2010-2011學(xué)年江蘇省鎮(zhèn)江市初三上學(xué)期期末考試英語卷 題型：其他題

根據(jù)短文內(nèi)容及所給首字母提示寫出所缺單詞, 并將完整單詞填在下面對(duì)應(yīng)題號(hào)后的橫線上。

  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(煙囪) 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.        

 

查看答案和解析>>

科目：初中英語 來源： 題型：

根據(jù)首字母 及上下文提示完成對(duì)話

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_____________

查看答案和解析>>

同步練習(xí)冊(cè)答案