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

Rosa liked making up stories. She was so __1__ that her classmates believed her from time to time. In fact, the whole class believed her! At first she supposed it was __2__. Now, as she got up to __3__ before the class, She knew that make –believe stories had some way of coming back to make you sad.
　　Rosa’s parents were separated. Nine months out of the year, Rosa lived with her mother in an apartment on Anderson Street. But when summer __4__, she went to her father’s farm in Arizona.
　　The farm was great! Rosa rode horses and __5__ with some farm work. Her father, however, was so __6__ that he couldn’t find time to go places with her. When she arrived each summer, her father would __7__ her at the airport and take her out to eat. And the day she went back to the __8__ he would always buy her a present.
　　When summer came to a close, Rosa __9__ to her mother. At school she heard lots of stories her friends told about their family trips. Rosa wished she had a __10__ to talk about.
　　Not long after __11__ began, Rosa was looking through travel magazines in the school library. They talked about many exciting __12__, like England and Germany. When Rosa’s friends asked what she had done that summer, she made up something that was not __13__. Remembering the travel magazines she had looked at, she told her classmates that she and her father had gone to __14__.
　　When the class began studying England, Mr. Thomas asked Rosa to tell all the things she could __15__ about her trip to England!

　　1. A. afraid            B. worried      C. sure           D. happy
　　2. A. joke          B. fun            C. turn      D. game
　　3. A. talk          B. teach         C. show     D. travel
　　4. A. passed        B. arrived      C. lasted      D. changed
　　5. A. made         B. played       C. helped    D. did
　　6. A. weak         B. pleased       C. busy       D. lonely
　　7. A. show          B. visit                C. meet          D. send
　　8. A. farm          B. city            C. family       D. school
　　9. A. wrote        B. called         C. moved      D. returned
　　10. A. family            B. school        C. teacher      D. farm
　　11. A. meeting     B. school        C. summer     D. talk
　　12. A. people      B. cities         C. languages D. places
　　13. A interesting  B. true           C. long           D. same
　　14. A. England      B. Germany    C. farm         D. home
　　15. A. think          B. see            C. remember D. read

My friend, Dick, has a large police dog. Its name is Jack. Every Saturday afternoon, Dick takes Jack for a long walk in the park. Jack likes these long walks very much.

One afternoon, a young man came to visit my friend. He stayed a long time. He talked and talked. Soon it was time for my friend to take Jack for a walk. But the man was still（仍然）there. Jack became very worried. He walked around the room several times and then sat down in front of the man and looked at him. But the man kept talking. Finally Jack couldn’t stand it. He went out of the room and came back a few minutes later. He sat down again in front of the man, but this time he held the man’s hat in his mouth.

1．From the story, we know that Jack is _______.

A．Dick’s good friend        　　  B．a large police dog 

C．a young man               　　D．a young man’s dog

2．Where does Dick walk his dog every Saturday afternoon?

A．In his room.    B．In the street.   C．In the park.  　　　D．In the field.

3．Jack became very worried one afternoon because ________.

A．Dick couldn’t take him out for a walk at the usual time.

B．a young man came to visit Jack that afternoon

C．Dick walked around his room several times.

D．he couldn’t find the young man’s hat

4．What does the underlined word “stand” mean in the passage?

A．站立         B．理解        C．支持       D．忍受

5．Why did Jack sit down again in front of the man with the hat in his mouth?

A．Try to make the man laugh.      B．Like the young man very much.

C．Ask the young man to leave.     D．Want to talk with the young man.

英汉词组互译（共10分，每小题0.5分）

1.hardly ever____________________

2.care about____________________

3.quite a few___________________

4.bring out____________________

5.as long as____________________

6.be similar to...________________

7.so far___________________

8.take sb’s place________________

9.have … in common____________

10.make up____________________

11.至少__________________        

12.当然_______________________

13.垃圾食品__________________

14.与…不同__________________

15.小学_______________________

16.例如_______________________

17.发挥作用，有影响____________

18.动作影片___________________

19.乔装打扮___________________

20.查明，弄清_________________