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

Tom and Simon were Americans. Once they visited Spain. One day they came into a little restaurant for lunch. They did not know Spanish, and the waiter did not know their American English, either. They wanted the waiter to understand that they needed some milk and eggs. At first Tom read the word “milk” many times. Then Simon spelled it on the table. But the waiter could not understand them at all. At last Tom took out of a piece paper and began to draw a cow. The waiter looked at it and ran out of the restaurant.
　　“How clever you are!” Simon said to Tom, “He understood us at last!” After some time, the waiter came back, he brought no milk with him, but two tickets for a bull-fight down on their table!
　　(　 )66. Where did Tom and Simon visit?
　　A. America　　　　　 B. Spain　　　　　　　 C. England
　　(　 )67. Tom and Simon went into a restaurant __________.
　　A. to buy a cow.　　　　 B. to have lunch　　　　 C. to draw a picture of cow.
　　(　 )68. The waiter did not understand Tom and Simon _________________.
　　A. because he ran out of the restaurant　　

B. because they wanted some milk and eggs
　　C. because he didn’t know American English and they didn’t know Spanish
　　(　 )69. Why did the waiter give them two tickets for a bull-fight?
　　A. Because Tom drew a cow not a bull.
　　B. Because the waiter was foolish.
　　C. Because the cow looked liked a bull.
　　(　 )70. How many people are there in the story?
　　A. Three.　　　　　　　 B. Two.　　　　　　 C. Many.

One day, my wife and I went shopping. We took the car as we had a lot of things to buy because my brother and his family were going to spend the weekend with us. We stopped the car in front of the shop. An hour later we came back to the car with a lot of things. Then the trouble started. We could not open the car door. “Oh, dear,” said my wife. “What are we going to do?” “Let’s ask that policeman,” I said. The policeman was very kind and glad to help us. Soon he got the door open. Just at that moment an angry man came up and shouted. “What are you doing with my car?” We looked at the number of the car, and our faces turned very red.

根据短文内容，选择正确答案(10分)

(　　)6.The husband and the wife went shopping _________.

A. by bus         B. in their car        C. by bike           D. on foot

(　　)7.They spent _________ in the shop doing their shopping.

A. half an hour        B. four hours        C. one hour         D. eight hours

(　　)8.The _________ opened the car door in the end.A. husband              B. wife          C. policeman       D. owner of the car

(　　)9.The owner of the car was very angry to see _________.

A. someone had opened his car door

B. the policeman standing by the car

C. his car was not there

D. that there was a trouble

(　　)10.They didn’t know it was the wrong car until they looked at the _________ of the car.

A. color    B. owner              C. door        D. number

One day, my wife and I went shopping. We took the car as we had a lot of things to buy because my brother and his family were going to spend the weekend with us. We stopped the car in front of the shop. An hour later we came back to the car with a lot of things. Then the trouble started. We could not open the car door. “Oh, dear,” said my wife. “What are we going to do?” “Let’s ask that policeman,” I said. The policeman was very kind and glad to help us. Soon he got the door open. Just at that moment an angry man came up and shouted. “What are you doing with my car?” We looked at the number of the car, and our faces turned very red.

根据短文内容，选择正确答案(10分)

(　　)6.The husband and the wife went shopping _________.

A. by bus         B. in their car        C. by bike           D. on foot

(　　)7.They spent _________ in the shop doing their shopping.

A. half an hour        B. four hours        C. one hour         D. eight hours

(　　)8.The _________ opened the car door in the end.A. husband              B. wife          C. policeman       D. owner of the car

(　　)9.The owner of the car was very angry to see _________.

A. someone had opened his car door

B. the policeman standing by the car

C. his car was not there

D. that there was a trouble

(　　)10.They didn’t know it was the wrong car until they looked at the _________ of the car.

A. color    B. owner              C. door        D. number