Learn English with American Primary School Textbooks

Chapter 7 Social Life (7)
9. You should drink four to six glasses of each day.

10. Food that is not good for you is called food.

Translation
Now you'll learn some ways to take better care of your body.

Teeth are very important to you.Have you ever heard people speak without teeth?They can't speak clearly.You need teeth to help you speak better.People without teeth will also have another problem, their expressions will not be as beautiful and cute as people with teeth.

Another reason teeth are so important is for chewing food.Without teeth, you can only eat soft foods, you will not be able to eat steak, apples or hamburgers.

Tom's father is a dentist, he came to the classroom to explain the problem of protecting teeth.He gave each student a toothbrush and a small tube of toothpaste, and showed them some pictures of proper brushing posture.He said: "Protecting teeth starts with a correct diet. You should eat some cheese, green leafy vegetables, and drink three or more cups of milk every day. Try not to eat sugar. It is good for you to eat more fruits.

"You should chew your food well. Chewing exercises the throat, gums and teeth, which is also beneficial. Also, chewing aids digestion.

"Remember to brush your teeth or rinse your mouth after meals. When brushing your teeth, you should brush in the direction of tooth growth, the upper teeth should be brushed down, and the lower teeth should be brushed up. Brushing your teeth in the correct way can help you brush away the tiny food particles between your teeth. and make sure you don't brush food into your gums. Be careful! Don't use your teeth as tools to bite hard objects or nuts, you may shatter your teeth.

"You should go to the dentist twice a year. If your teeth are starting to decay, you can't see it yourself, but the dentist can tell you. Even if you brush your teeth very carefully, sometimes there will be some food left between the teeth. Daily Floss should be used to remove food residue after brushing."

Just like you protect your teeth, you should also protect your eyesight.When you're reading, make sure there's enough light, and the light should be above your shoulders.

Don't look directly at the sun.Wear sunglasses when the sun is very bright, such as at the beach or in the snow.Good food can also help protect your eyes, like the vitamins in carrots that help you see at night.When using scissors or pointed tools, be very careful to keep them out of your eyes.Be careful with other people around you too, don't hurt other people's eyes.

Now that you've learned how to take care of your teeth and eyes, I'm going to tell you how to take care of your body.

You should breathe deeply, it helps your body work better.Also, when standing you should keep your head and shoulders straight.If you stand upright, your body will have enough space inside to work better.

You have to eat healthy food and drink water.If you drink 4-6 glasses of water a day, your body will be at its best.

You can also wash it with water.You need to shower every day and wash your hair at least once a week.If you wash your hair enough times, it will be shiny.You will also need to wear clean clothes every day.

Make sure you get enough sleep at night.Every night, you should have 8-10 hours of sleep.If your body is exercising every day, it will get tired.You need to stay strong, and sleep is the way to rest a tired body.

Not only should you keep your body clean, but you should also strive to keep your mind clean.What do you think makes you happy or unhappy?If you love your friends, you will treat them well.You should be friendly and loving, and you won't be happy if you let your head be filled with bad thoughts.To be healthy, you don't want to fill your belly with junk food.In the same way, in order to have a healthy and happy mind, you need to fill it with the good thoughts of the world.You do your best to think, read, and act the best you can.

Exercise
Fill in the answers in the blanks.

1.I can keep my teeth healthy by eating foods such as, ,

and.

2.To exercise my throat and teeth, I need to chew my food.

3.When I brush my teeth, I should brush in the direction of my teeth.

4.Every year, I should see the dentist.

5.I shouldn't have had teeth as one.

6.In bright light, you should wear glasses.

7.In order to see better at night, you should eat.

8.You should take a bath every time.

9.You should drink 4 to 6 glasses a day.

10.Those foods that are not good for you are called foods. ?
1. cheese (cheese), milk (milk), leafy vegetables (green leafy vegetables)
2. well (full) 3. grow
4. twice (twice) 5． tool
6. sun (sun)7. carrots

8. day (day)9. water

10. junk (garbage)
09Electricity and electric current get along safely

Scientists realize that they do not know all about electricity. They know how electricity acts, but they do not know why it acts the way it does.
One of the keys to understanding electricity is understanding lightning. When some of the electrical charges in clouds move from cloud to cloud or from a cloud to the ground, we see a huge spark. This spark we call lightning. Benjamin Franklin did a famous experiment . He attached a key to the end of a kite string. Franklin flew his kite in the air during a thunderstorm. The kite became charged with electricity. A spark jumped from the key to his finger. By this dangerous experiment Franklin proved that lightning is electricity.
Atoms, electrons, and electricity are related to each other. All objects are made up of atoms. Each atom is made of tiny particles called protons and electrons among other things.
Protons are found in the center of the atom. They stay in the center of the atom and never move out. Electrons revolve around the protons and can travel out of the atom. When electrons are removed or added to an atom, that object becomes electrically charged. When an object has more protons than electrons, the object is positively charged. The object that receives the electrons is negatively charged. When an object has an equal number of positive and negative particles, the object is neutral.
Although scientists know that lightning is a form of electricity, they do not know how to make use of it. The electricity from lightning comes and goes in a flash. In order to be useful, electricity must flow. Electricity that flows is current electricity.
An Italian scientist, by the name of Volta, made an important discovery. He found that when two different metals connected by a wire were placed in certain liquids, an electric charge would flow through the wire. The two pieces of metal were electrodes. The liquid was called an electrolyte. Volta had discovered how to make a wet cell battery.
Electricity must have a conductor. Conductors are materials that carry electricity from place to place. Most metals are good conductors, but some are better than others. Copper and aluminum wires are very good conductors. A covering on the wires, called an insulator, is necessary to keep the electricity from flowing out of the wires into the wrong place. Electricity will not flow through an insulator. Electricity is not safe and should never be used without insulation. Materials often used as insulators are rubber, glass, and cloth.
The wire which carries the electric current is called a circuit. Electricity must always travel in a complete circle. That is, it must start and end at the electric cell. A switch is used to break the circuit. A break in the circuit stops the flow of electricity. When the switch is open, the current stops; when the switch is closed, the electricity begins to flow again.
Electricity has many uses. If it is used correctly, it is helpful in doing many kinds of work. It lights our homes. It moves large trains. It helps lift heavy loads. If it is not used correctly, it can be very harmful. Some rules to remember when working with electricity are listed in the following.
Rules and Safeguards to Follow:

1. Have dry hands before touching a switch, electric cord, fuse, or any type of electrical equipment.
2. Do not allow any part of your body to touch a water pipe or faucet while working with electricity.
3. Do not stand in water or on a wet surface when working with electricity.
4. Check all cords to see that they are properly insulated.
In addition to these rules, safeguards must be taken to prevent fires when electricity has been routed into a building. One way that is used to prevent fires is to route the circuit through a fuse. A fuse is a small insulated container through which a thin piece of metal is stretched. If too much current passes through the strip, the metal will burn and break the circuit. A circuit breaker also prevents electrical wires from carrying too much current. The circuit breaker does the same job as a fuse but does not have to be replaced. The breaker switch can be returned to its closed position in order to restore the current.
(End of this chapter)