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

 

Just a Quick Nap 只要打个盹儿

Do you feel a little sleepy after lunch? Well, that’s normal. Your body naturally slows down then. What should you do about it? Don’t reach for a coffee! Instead, take a nap.

It’s good to have a daily nap. First of all , you are more efficient(有效的) after napping . You remember things better and make fewer mistakes. Also, you can learn things more easily after taking a nap. A nap may increase your self-confidence(自信) and make you more active . It may even cheer you up. But, there are some simple rules you should follow about taking a nap. First, take a nap in the middle of day, about eight hours after you wake up. Next, a 20-minute nap is best. If you sleep longer, you may fall into a deep sleep. After waking from a deep sleep, you will feel worse. Also, you should set an alarm clock. That way, you can fully relax during your nap. You won’t have to keep looking at the clock so you don’t oversleep.

Now,the next time you feel sleepy after lunch , don’t get stressed . Put your head down, close your eyes, and catch forty winks.

1.It is       to get sleepy for you at noon.

A. normal          B. strange         C. amazing

2.After taking a nap, you may feel more        .

A. stressed         B. confident        C. sleepy

3.The proper period(一段时间)of time for taking a nap is      .

A. as long as you like       B. eight hours     C. about twenty minutes

4.What can help you have a fully relaxing nap according to the passage?

A. A cup of coffee.         B. A quick meal.   C. An alarm clock.

5.What is the text mainly about?

A. Why and how to take a nap.

B. Rules to increase your self –confidence.

C. How to make your body slow down.

 

The advantages of Eating Fruits & Vegetables

Vegetables and fruit are good for your health because of a lot of vitamins, nutrients(矿物质) and fiber(纤维)in them. Fruits and vegetables are regarded as a healthy diet without adding chemicals or additives(添加剂) for carrying or storing foods. The United States Department of Agriculture suggests eating plenty of fruits and vegetables every day to get the advantages of eating a healthy diet.

Disease Prevention

The United States Department of Agriculture tells that eating fruits and vegetables helps fight strokes, cardiovascular disease and type 2 diabetes. Because of the potassium in fruits and vegetables, they can prevent the risk of developing kidney stones. The fiber in fruits and vegetables helps the body fight against coronary heart disease.

Idea Health

Since fruits and vegetables add to a balanced and healthy diet, eating these will help you with your idea. The vitamins in fruits and vegetables helps fight depress(沮丧), according to the Mental Health Foundation. Vitamin B and folic acid found in some vegetables and bananas help you to relax. Eating fruits and vegetables can also help improve memory.

Healthy Weight

Eating fruits and vegetables helps you have a healthy weight. Fruits and vegetables naturally include less energy than other foods, according to the Center for Disease Control and Prevention. The fiber and water in the fruits and vegetables make you feel that you are full, so you will not feel that you have to eat more food.

1.According to the passage, how many things are included in the vegetables and fruit?

A.3                B.4                C.5                D.6

2.What kind of fruit should you eat if you were stressed out?

A.Vitamin           B.Folic acid          C.Bananas           D.Apples

3.Which of the following is not disease?

A.Potassium         B.Strokes           C.Cardiovascular      D.Type 2 diabetes

4.The United States Department of Agriculture suggests that_____.

A.eating plenty of fruits and vegetables every day instead of having food.

B.eating plenty of fruits and vegetables is good for helping fight disease.

C.eating some vegetables and bananas help you to relax.

D.eating fruits and vegetables helps you have a healthy weight.

5.According to the passage, eating plenty of vegetables and fruit can’t____.

A.prevent disease                        B.improve memory

C.help you have a healthy weight             D.let you want to eat more food

 

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