With more and more cars on the road, the traffic jam will happen. How do we see it and how can we solve the problem?

    We know that the traffic jam(堵塞)happens in many places, especially in big cities. What are reasons for the problem? On one hand, some people think that they should have a car when they have enough money, and then it's easy to go out and they can feel comfortable. On the other hand, a growing number of people hope to use their cars to show off (炫耀). What's more, years of research has shown that one of other reasons for the traffic jam is the driving habit. For example, many young people enjoy driving very fast, so they can feel excited. At last, most of them hardly care about the speed rules.

    Many governments are working at how to make the traffic better. In my opinion, firstly, the governments should educate those people who have cars or plan to buy cars. The governments must make them know that the traffic jam is very serious, and set up a much more perfect traffic system (体系)to solve the traffic pressure.

Mobile phones are becoming more and more popular not only with adults but also with students. However, they also have become a problem for middle schools in the last few years.

Some children have got mobile phones as Christmas or birthday gifts, and more will ask their parents to buy phones for them.

Many students like mobile phones because they are easy and quick. Some parents feel it convenient because they can get in touch with their children. Some teachers think using mobile phones is a distraction(分心的事)to students during school hours and mobile phones also give them much trouble in their classrooms. Sometimes students send phone messages to cheat(作弊)during exams. A new study says that some teenagers even hurt their fingers because of the over-use of mobile phones. They keep using mobile phones for more than ten hours during a day.

Many teachers suggest that students should not have phones at school, but if there is a good reason, they can leave their phones at the school office. Many people think they understand why parents would want their children to have them, but they agree school should let the students know when they can use their mobile phones.

As the weather gets warmer，there are few things that are better to do than travel．But traveling might not be that fun for everyone，especially for those who have motion sickness（晕动症）．

Motion sickness is also called travel sickness．It is a common experience for many people．Depending on how you travel，it can be called carsickness or seasickness．People with motion sickness feel very uncomfortable while they are in motion．They feel sick and dizzy，like the room around them won't stop spinning．

It is generally believed that motion sickness happens when your senses become confused （困惑的）with each other，Scientific American reported．

We use different parts of our body to sense movement．Our eyes tell us if we are moving．The inner ears （内耳） contain a special liquid that helps us sense our direction and balance．Our muscles react to movement．

When you move around，these body parts work well together．But when you are in a car or an airplane，they get confused．Your inner ear signals that you're moving．This mismatch gives us motion sickness．

But some people are less sensitive to motion sickness．This may be because they have certain genes （基因） that prevent mismatching senses，Bethann Hromatka，told the Atlantic．

Although there are many ways to deal with motion sickness，scientists believe that the key is to simply try to adapt to it．For example，some astronauts do special exercises that give them mild motion sickness．After a week or two，the astronauts become used to it and don't feel uncomfortable anymore，a NASA flight doctor，told the BBC．

Dear Mike,

How is everything? I am not happy these days. My parents are angry with me because they think I live an unhealthy life on weekends. They want me to spend my weekend like my sister Jenny.

I always get up late. So I usually have nothing for breakfast. I play basketball for an hour then. For lunch, I often eat out. Hamburgers and ice-cream are my favorites. I know they are not good for me, but they taste great. After lunch, I usually go to the movies with my friends. Sometimes, I sleep all the afternoon. In the evening, I either watch TV or play computer games. I don't go to bed until eleven thirty.

But Jenny is different. She never gets up after six thirty. Then she brushes teeth and does morning exercises. After that, she has milk and eggs. She does her homework all the morning. For lunch, she eats rice, meat, fish and vegetables. She studies for 3 hours before she eats dinner. Sometimes, she helps with housework after dinner. Then she goes out to take a walk. She reads and takes a shower before going to bed."What a great day I have!"Jenny always says.

It is weekend! I just want to relax myself well. I don't like to hear my parents always say the same words again and again to me. It's terrible to live like Jenny! What can I do?

Yours,

Leo

①Eating good food and getting proper exercise are important to stay healthy. Getting enough sleep is important, too. Experts say that teenagers between the ages of 15 and 20 need 8 to 10 hours of sleep each night. 

②Your body needs to take a rest from all the activities it has done during the day. Your brain needs a rest, too. You are likely to get sick easier without enough sleep. 

③You have a "24-hour clock" inside your body that tells you when to be awake and when to go to sleep.  ▲  Blue light that comes from the Sun tells your brain to keep you awake during the day. When there is no blue light at night, the brain tells the body that it's time for sleep. 

④There are many things that stop the brain from telling your body when it's time to sleep. One of these is blue light at night. Today, people spend a lot of time watching television or looking at screens on computers or smart phones. These devices (装置) give off blue light. If you look at them at night, the blue light can trick your body into thinking it's daytime. Then it is more difficult to go to sleep.

⑤What should you do to get good sleep? Experts say that you shouldn't look at screens that give off blue light for at least one hour before going to sleep. 

⑥ Do not watch TV or use anything with a computer screen in bed. If you need to do something to fall asleep, it is better to read a book. Also, keep your bedroom as dark as you can. This will help you sleep well.