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
James is a good student and he has lots of friends，but he also has a problem．Some older boys are bullying(欺负)him at school．James is very unhappy and he doesn't know what to do about it．Here are some suggestions to him and other teenagers in this situation．
Don't feel worried．It's not your fault(过错)! Being bullied can make you feel very lonely and angry，but you are not alone．Don't feel that you have to hide the problem．You should find a person you can trust，and tell them．It might be your teacher，your parents，or even your friend's parents．After you tell someone，you will get some support and feel some relief(解脱)．
Speaking to an adult might make you nervous，but here are other things you can do．Some people express their feelings more easily on paper．Write a letter to someone or keep a diary．Include all the details(细节)about what the bullies do, as well as when and where the bullying happens．You can use it as proof to show what is going on．And it is a wonderful idea to show your letter or diary to a teacher or another responsible adult．Then the bullies will feel very afraid if their names appear in a letter!
Also，don't show you are sad and don't try and fight with the bullies. You could get in trouble yourself. Ignore them and just walk away. The bullies will soon stop.
1.What do you think the text is trying to tell us?
A. What to do about being bullied.
B. How to be a good student at school.
C. What to write well in a diary.
D. How to give suggestions to teenagers.
2.You'd better go and find a person you can trust and ____.
A. know what happens B. learn from them
C. ask for help D. make them lonely
3. If you remember and follow the suggestions above, ____.
A. nobody will speak to the bullies
B. everybody will feel some relief
C. someone will express their feelings
D. the bullies will soon stop
4.What does the underlined word "ignore" mean in the text?
A. take no notice of B. take care of
C. make full use of D. get more help from
Here are four poems written by some students named Owen, Angela, Roger and Kevin.
1.Which of the following is mentioned in both Owen’s and Roger’s poems?
A. Smiles and flowers. B. Bees and flowers.
C. Birds and flowers. D. Leaves and flowers.
2.Roger enjoys spring by _______ it.
A. smelling B. playing C. listening D. watching
3.All the poems describe the spring except ______.
A. Owen’s B. Roger’s C. Angela’s D. Kevin’s
When I was 16 years old, a boy gave me an important gift. It was a .
It was the early autumn of my first year at a middle school, and my old school was far away. a result, no one knew who I was. I was very , and afraid to make friends with anyone.
Every time I the other students talking and laughing, I felt my heart . I couldn’t talk to anyone about my problems. And I didn’t want my parents to me.
Then one day, my classmates talked with their friends, but I sat at my desk unhappily as usual. , a boy came into the classroom. I didn’t know he was. He passed me and then turned back. He me, without a word, but a smile.
, I felt the touch of something bright and friendly. It made me feel happy and .
That smile changed my life. I started to talk with other students and made friends. Day by day, I became to everyone in my class. The boy with the lucky smile has become my best friend now.
One day I asked him why he smiled, but he couldn’t remember at me!
I have been happy every day all the dark days have gone. I believe that the world is what you think it is. If you think you are lonely, you might always be alone. So smile at the world and smiles will come back to you.
1.A. kiss B. smile C. hug D. bow
2.A. For B. Because C. As D. Since
3.A. lonely B. happy C. hungry D. popular
4.A. heard B. listened C. listen to D. heard of
5.A. sing B. playful C. broken D. dance
6.A. look for B. worry about C. feel glad like D.know about
7.A. loudly B. quietly C. sadly D. happily
8.A. At present B. Just at that moment C. By the time D. For a moment
9.A. whose B. that C. which D. who
10.A. looked at B. looked for C. looked like D. looked after
11.A. Suddenly B. Luckily C. Hurriedly D. Seriously
12.A. cold B. warm C. sad D. alone
13.A. near B. nearly C. closer D. closely
14.A. laughing B. looking C. meeting D. smiling
15.A. though B. because C. even if D. until
— Look at the sign on the right.
— Oh, parking here.
A. isn’t allowed B. doesn’t allow
C. wasn’t allowed D. is allowed
There _______a river in front of my house.
A. used to have B. was used to be C. used to be D. was used to being
