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

Have you ever thought of taking a train and having an adventure (奇遇)？Riding the train can be a real adventure.That is how I feel every time I take Amtrak.I often take a four?hour trip to visit my children.Every time I take this trip I never know what will happen.

Last week when I was on the train and over an hour into the train ride，there was a man sitting by himself in the back of the train carrying on a mobile phone conversation— in another language.It was loud and disturbed most of the people on the train.I think it was annoying.

Fortunately I sat next to a wonderful old lady who was taking a two?day trip by train.She said her two daughters were distraught at the thought of her driving for three days to reach her home，although she had no trouble driving.The train ride was the only choice for her.She loved to look out of the window and watch the world go by on the train.

She was fun to talk to and asked me when my children started being parents.That is a very good question.Both of us are old and have children.She asked that same question from time to time.

There are always many people on the train from all walks of life，different countries，and many languages.Riding the train is a great way to increase your knowledge and take in all kinds of cultures.If you get hungry，you can buy food in the food car at any time.If you need to use the restroom there is always one available.

It sure beats driving the car，which has to stop for food and restrooms.And it is better than taking the bus.

1．According to the passage，the purpose of the author’s train ride was________.

A．to do business　　　　　　　　　　　　 B．to see her children

C．to visit places of interest 　　　　　　　　　 D．to see her old friends

2．Which of the following is the closest in meaning to the underlined word “distraught” in Paragraph 3?

A．Disappointed. 　　　　　　　　　　　　　　　　　 B．Satisfied.

C．Worried. 　　　　　　　　　　　　　　　　　　　　　 D．Pleased.

3．Which of the following is TRUE about the old lady sitting next to the author?

A．She is too old to drive now.

B．She does not like to take trains.

C．Although she is old，she has a good memory.

D．Her daughters live far away from her home.

4．In the author’s opinion，on the train Amtrak________.

A．the services are quite good

B．the food is terribly expensive

C．all the passengers are polite

D．all the passengers are American

5．What is the best title for this passage?

A．Train ride—a cultural experience

B．A painful experience on the train

C．The history of Amtrak

D．A wonderful lady

What do we do when we go camping? First, we think of a plan. We take food, clothes, a knife, and things for cooking and eating. We take things to keep us away from insects and the sun. Then we put everything into the car and we drive to the woods. We look for a place for campers (露营者) and we look for a good place for our tent(帐篷). The place should have a lot of air. This will keep some insects (虫子) away. High land with water on both sides of it is good. Then we put up our tent. We put everything into the tent, and we are ready for fun. We can swim in the lake, walk in the woods, climb a mountain, row a boat, or go fishing. In the evening we come back to the tent, we build a big fire because it can keep the insects away. We sit around the fire and talk. We may tell interesting stories or we may sing songs. At night we lie down on the grass. We can look up at the stars. It is a busy day, so we try to go to sleep early. Everything is dark. Everything is quiet. We hope we won’t hear music from the radio in the next tent. We hope it won’t rain.

1. Before going to camp we should first ___________.

A．think of a plan

B．take some food

C．take things to keep us warm

D．take something for cooking and eating

2. We go to camp __________.

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

3. Campers can join in ________ activities.

A．one or two        B．only a few         C．many             D．two or three

4. In the evening we build a fire because ________.

A．it is cold at night                        B．it can keep us warm

C．it can keep the insects away               D．it is dark and quiet

5. The campers like to ____ at night.

A．hear music from the radio　               B．go to sleep early

C．have rain                              D．be busy

—How far is it from the supermarket to your home?

—It’s about                .

A. 20-minute drive　B. 20-minutes’ drive　C. 20 minute’s drive　D. 20 minutes’ drive

Americans with small families own a small car or a large one. If both parents are working, they usually have two cars. When the family is large, one of the cars is sold and they will buy a van(住房汽车)

　　A small car can hold(容纳)four persons and a large car can hold six persons but it is very crowded(拥挤). A van hold seven persons easily, so a family three children could ask their grandparents to go on a holiday travel They could all travel together.

　　Mr.Hagen and his wife had a third child last year. This made them sell a second car and bus a van. Their children sixth and seventh seat are used to put other things, for a family of five must carry many suitcases(衣箱)when they travel. When they arrive at their grandparents’home , the suitcases are brought into the two seats can then carry the grandparents.

　　Americans call vans motor homes. A motor home is always used for holidays. When a family are traveling to the mountains or to the seaside, they can live in their motor home for a few days or to the seaside, they can live in their motor home for a few days or weeks. All the members of a big family can enjoy a happier life when they are traveling together. That is why motor homes have become very popular. In America there are many parks for motor homes.

1.From the passage, a van is also called ____________.

A．a motor car                            B．a motor home

C．a motorbike　                          D．a big truck

2. Before Mr. Hagen and his wife bought a van, they__________.

A．sold their old house

B．moved to their grandparents’house

C．built a new place for a van

D．sold their second car

3. A motor home is usually owned by a family with__________.

A．a baby　                              B．much money

C．more than two children                   D．interest in vans

4. Americans usually use motor homer____________.

A．to travel with all the family members of holiday

B．to do some shopping with all the family members

C．to visit their grandparents at weekends

D．to drive their children to school every day

5. Motor homes have become popular because___________.

A．they can take people to another city when people are free

B．they can let families have a happier life when they go out for their holidays

C．some people think motor homes are cheap

D．big families can put more things in motor homes