4 . Do you want to know what our life will be like in the future? Let’s have a look. You may get a surprise. You will go to the kitchen when you are hungry. You will give orders to the kitchen robot. The robot will cook the food for you in a few minutes. Then it will bring it to you.

In the kitchen you will find a special food machine. The food machine will tell you what your body needs. It will help you eat healthily. The food machine will be connected with (连接) the kitchen robot. The robot can get messages from the food machine. After having a meal, you can go to your home office. You will work at home and you don’t need to go out to work any more.

You will have a special information screen. You can get any information on the screen. When you receive a message from a friend in America, your information screen will be turned on automatically (自动地). Your friend’s face appears on the screen. Then you can talk to your friend easily.

5 . This is a street crossing. There are red and green lights at each corner. Drivers must watch the lights carefully.

When there is a green light, the cars may go. When there is a red light, the cars must stop. They must wait until the red light changes to green. Then they can go on. Sometimes the cars want to make a right turn or a left turn. They can make a right turn when the light is green or red. But they must wait until the green light is shining if they want to turn left.

Some people are color-blind(色盲). They can not tell the difference between the red and green lights. These people must not drive, or there will be accidents. We must keep our streets safe.

6 . A city without cars would be very strange, right? But Venice is such a city.

Venice is in the northeast of Italy. It wasn't built on land like Beijing or Shanghai, but on more than 110 islands. Seawater is everywhere around the city.

Even so, travel isn't difficult. The water ways have always been the best way to get around. There are 177 canals and more than 400 bridges that can guide you to where you want to go. People in Venice move from place to place by boat. They like to enjoy the scenery and cool summer nights while taking boat trips. They can talk to other people as they go along.

Venice grew out of small islands in saltwater lakes when some Italians escaped from a war over 1,500 years ago, and built homes there.

Water makes the city special, but it is also a big problem. Sometimes tourists will have such strange experiences. One moment they walk across the Rialto Bridge, and there's nothing special. But when they come back to the bridge an hour later, it's underwater and everyone is wearing rain shoes.

Once, people used too much underground water. This made the city get lower little by little. Now the city has gone down by about 23 centimetres. Another problem is the rising seawater. The temperature has risen over the years. This has made the ice of the Arctic Ocean(北冰洋) melt(融化) .

Every year, high water hits the city in autumn and winter. When a lot of water comes, more than half of the city is underwater.

Scientists are trying different ways to stop the city from getting even lower. The Italian government has asked some of Italy's biggest companies to build the MOST project, which is planned to be built under the seawater to stop the rising water. Anyway, this project is helping solve the problem.

7 . Teeth are important. Strong, healthy teeth help you chew（咀嚼）foods that help you grow. They help you speak clearly. And yes, they help you look best. Here are some tips for you to take care of your teeth:

1. Brush your teeth in the right way.

Brush your teeth at least twice a day—after breakfast and before bedtime. If you can, brush after lunch or after sweet snacks, too. Brush all of your teeth, not just the front ones. Spend time brushing teeth along the sides and back of your mouth. Spend at least three minutes each time you brush. Play a song you like to help pass the time. Get a new toothbrush every three months. When you buy toothbrush, be sure it has soft bristles（鬃毛）.

2. Learn how to floss（用牙线清洁牙齿）your teeth.

Flossing is a very important way to keep your teeth healthy. Food may hide between two teeth. Flossing can help get rid of it. You'll need to floss your teeth at least once a day.

3. Have good eating habits.

You need to be careful about what you eat and drink. Eating sugar is a main cause of tooth decay（蛀牙）. Eat lots of fruits and vegetables and drink water instead of soda（苏打）.

8 . For kids, it's very important to stay healthy. Kids should pay more attention to their lifestyle and help themselves have healthy life habits. Here are some tips on staying healthy for kids.

Kids hardly care about basic hygiene（卫生）, they share everything from drink to snacks. So it is important for kids to know the basic hygiene habits such as washing hands before eating, brushing teeth at least twice a day and so on. Similarly, kids should protect themselves from other kids with different kinds of infections（传染病）.

Healthy eating helps to live a healthy life. Kids should pay attention to the eating habits. Encourage themselves to eat healthy food such as fresh fruit and vegetables. And eat different kinds of food at different ages. Kids should know junk food is bad for health and try to eat less junk food.

Different activities can be planned to teach kids the importance of staying healthy. Some simple reading materials can let the kids know about their bodies. Also, playing games about brushing teeth, having meals is very useful and funny for kids. Certain group games and activities or even funny street plays can also help the kids understand the importance of staying healthy.

9 . Parents always want the best for their kids. But everyone has their own way of parenting(养育). Here are some popular parenting styles. Which one do you like best?

10 . It might be fun to use your smartphone, but be careful. Too much screen time may be harmful to your health.

First, it is bad for your eyes. A researcher called Sarah Hinkley says the problem comes from the blue light that the screen gives out. Looking at a smartphone for a long time can cause eye strain（劳损）, headaches and dry eyes. So it is a good idea to take a break every 15 minutes when you are working at a computer or using a smartphone.

Second, screen use can do harm to children’s brains. A new study shows that using screens too much can affect（影响） how children’s brains grow. If children use screens for more than one hour a day, they might have lower levels of white matter in their brains. White matter is a key to the development of language and reading skills. So it is wise to cut down the time of children using all kinds of screens.

Third, using screens too much will affect your sleep. According to a study, about 95% of the people between the ages of 13 and 64 use electronics before bed, especially the young people under 20. Doctors say that the light from those electronics at night may make you excited before you go to bed. Then it’s hard for you to get enough sleep. So you’d better turn off smartphones, TVs, and all other screens an hour before your bedtime.

To keep healthy, doctors and researchers strongly advise that you shouldn’t use screens for long hours.