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

阅读理解

　　John：Why is Bob absent from school today?

　　Bill：He is in bed at home with a broken leg.

　　John：That's too bad. What happened?

　　Bill：A car ran through a red light and hit him while he was on his way home after school yesterday.

　　John：I'm sure it was the driver's mistake.

　　Bill：It certainly was. Many drivers just drive carelessly though there are better roads today.

　　John：But there are also many cars today and they seem to run faster and faster.

　　Bill：In fact, smoother (更平坦) and wider roads only bring about more dangers.

　　John：That's true. We can't travel fast and safely if we don't obey (遵守) the traffic rules (交通规则).

(1) Why didn't Bob go to school?

[　　]

A．He liked to lie in bed.

B．He wanted to stay home.

C．He couldn't walk.

D．He liked to drive on wide roads.

(2) What brought about Bob's trouble?

[　　]

A．Bob's absence (缺席) from school.

B．Bob's going home after school.

C．Too many traffic rules.

D．The driver's careless driving.

(3) What was the driver's mistake?

[　　]

A．He drove carefully on his way home.

B．He didn't obey the traffic rules.

C．He drove on smooth and wide roads.

D．He had to look out for other cars.

(4) Why do smoother and wider roads bring more dangers?

[　　]

A．Because there are more and more cars.

B．Because people get legs broken easily.

C．Because there are more new traffic rules.

D．Because there are many cars and people drive fast.

(5) Traffic accidents happen easily for ________.

[　　]

A．people are fond of travelling long distance (距离)

B．better roads today bring about more cars and the fast speed driving

C．few drivers know little about the traffic rules

D．travellers prefer driving to walking when they go out in the street

阅读理解

　　“If you want to see a thing well, reach out and touch it!”

　　That may seem a strange thing to say. But touching things can help you to see them better.

　　Your eyes can tell you that glass ball is round. But by holding it in your hands, you can feel how smooth(光滑的) and cool the ball is. You can feel how heavy the glass is.

　　When you feel all these about the ball, you really see it.

　　With your skin (皮肤) , you can feel better. For example, your fingers can tell the difference between two coins in your pocket. You can feel a little drop of water on the back of your hand, too.

　　You can even feel sounds against your skin. Have you ever wanted to know why some people like very loud music? They must like to feel the sounds of music.

　　All children soon learn what “Don't touch!”means. They hear it often. Yet (然而) most of us keep on touching things as we grow up. In shops, we touch things we might buy, such as food, clothes and so on. To see something well, we have to touch it.

　　The bottoms(底部) of our feet can feel things, too. You know this when you walk on warm sand, cool grass or a bad floor. All feel different under your feet.

　　There are ways of learning to see well by feeling.

　　One way is to close your eyes and try to feel everything that is touching your skin. Feel the shoes on your feet, the clothes on your body, the air on your skin. At first, it is not easy to feel these things. You are too used to them!

　　Most museums are just for looking. But today some museums have some things to touch. Their signs say, “Do touch!” There you can feel every thing on show.

　　If you want to see better, reach out and touch. Then you'll really see!

1．By touching things ________.

[　　]

A．you will have a strange feeling

B．you will learn how to reach out

C．you can tell the difference between them

D．you can tell what colours they are

2．Which of the following can be the best title of the story?

[　　]

3．When people buy things in shops, they often ________.

[　　]

A．try them on first

B．put their right hand on them

C．just have a look

D．feel and touch them

4．Why does it say, “At first, it is not easy to feel these things?”

[　　]

A．The things are used by people, too.

B．People are used to the things.

C．People know how to use the things.

D．The things are easy to feel.

5．Which of the following is true?

[　　]

A．Touching can help people learn things better.

B．Our feet, fingers, hands and skin can help us enjoy music.

C．People have to learn to see by feeling as they grow up.

D．Visitors cannot feel the things on show in some museums.