Smog(雾霾) is a big problem in many Chinese cities. But it seems that besides wearing a mask, few of us know what has caused the smog and what to do to beat it. Chai Jing, a former news hostess with China Central Television, discussed the questions in her documentary Under the Dome.

    The 103 - minute film was published on major Chinese video - sharing websites on Feb 28. In the film, Chai visits polluted places and talks to officials and scientists. She comes to the conclusion that burning too much coal and oil are the main causes of PM2.5 and smog.

    To make things worse, according to Chai, the coal and oil we are burning is of poor quality and don't meet the standards for environmental protection. Therefore they have produced more harmful gas to pollute the air.

    To solve the problem, Chai suggests that we should clean our coal and oil or replace them with cleaner energy such as natural gas. In her film, Chai also pointed out that ordinary people can do something to help control smog too. For example, we live a greener life by using more public traffic. Or if we see things that could harm the environment, we can try to stop it. In one scene from the film, Chai sees a dirt mound in a building site exposed in the air, and asks the person in charge to cover it. When she sees a restaurant cooking without any suitable filter facilities, she calls the hotline 12369. The restaurant installed the filter a week later.

    Chen Jining, the new minister of environmental protection, praised Chai. "This film encourages ordinary people to care about the environment. This is what we need in the future. "

Differentweather makes people feel different. It influences health, intelligence andfeelings.

InAugust, it is very hot and wet in the northern part of the United States.People there have heart trouble and other kinds of health problems during thismonth. In the Northeast and the Middle West, it is very hot at some times andvery cold at other times. People in these states have more heart trouble afterthe weather changes in February or March.

Theweather can also influence intelligence. For example, in a scientific report,IQ of a group of students was very high when a very strong wind came, but afterthe wind, their IQ was 10% below. The wind can help people have moreintelligence. Very hot weather, on the other hand, can make it lower. Studentsin many schools of the United States often get worse on exams in the hot monthsof the year（July and August）.

Weatheralso has a strong influence on people's feelings. Winter may be a bad time forthin people. They usually feel cold during these months. They might feelunhappy during cold weather. But fat people may have a hard time in hot summer.

Low air pressure may make people forgetful. Research shows that people leave more bags on buses and in shops on low-pressure days. However, at about 18℃, people become healthier and stronger. People feel best at this temperature.

Areyou feeling tired, forgetful or unhappy today? It may be the weather's problem.

Chinese martial arts, also called kung fu, make up a number of fighting styles that have developed over the centuries in China. Chinese kung fu started in China. It is {#blank#}1{#/blank#} fast as the wind, as stable (稳定的) as the mountains and as powerful as fire. Kung fu is not only {#blank#}2{#/blank#} (use)but also graceful. Therefore, kung fu is {#blank#}3{#/blank#} (regard) as the Oriental martial art. Many foreigners want to learn it, {#blank#}4{#/blank#} more and more special schools for learning martial arts appeared in many other countries around the world. 

Over centuries of development, the term "kung fu" has now covered a number of fighting {#blank#}5{#/blank#} (style). The famous ones are tai chi, Shaolin kung fu and ginggong. Kung fu is good {#blank#}6{#/blank#} health and self-defense(自我防卫). In recent years, kung fu {#blank#}7{#/blank#} (become) more and more popular all over the world. 

There have been famous kung fu {#blank#}8{#/blank#} (star) like Bruce Lee. He played {#blank#}9{#/blank#} important role in {#blank#}10{#/blank#} (develop) Jeet Kune Do(截拳道). His kung fu u skills have been kept alive by actors like Jackie Chan. Nowadays, many people still learn kung fu skills. 

Do you have a dog? What can your dog do for you? Do you know that dogs can read our feelings? Now some people find that dogs can smell people's stress(压力). 

Dogs are really man's best friends. They have special smell. A new study said that dogs can smell if people are feeling stressed. Teachers at Queen's University, the UK, made the study. They got breath(呼吸) and sweat(汗) from people both before and after doing a hard maths problem. They looked at people's heart rate(心率), blood pressure(血压) and stress feeling in the study. Dogs can smell the differences in breath and sweat from people. Then they can know when people are stressed. 

The finding is wonderful: Dogs found stress in 675 of the 720 people. " They could be 93. 75% right!" Australian News reported. The study's writer Clara Wilson said, " Stress can change people's breath and sweat. Dogs are very good at smelling these changes. " In the study, she also said, " This finding helps us learn that how dogs may know people's feelings. "

This finding shows how special the bond is between people and dogs. The finding also tells us that dogs are very clever. And maybe dogs can help stressed people. 

Taking notes(笔记) is an important part of learning. Students listen to the teacher. They write down the important things. Or they use a computer. These days, many students take a computer to class to type(打字) their notes. 

Some people think that using a computer is better. People type faster than they write. That means they can write more. If you can type fast, you can type every word the teacher says. 

Computers are becoming very common in classrooms. Almost every student in university has a computer small enough to take to class in order to type notes. Fewer students write things down. So there is a trend in schools now to spend less time on teaching kids how to write. Schools are moving away from teaching younger students how to write by hand. Many people see no need for writing by hand. 

However, studies advise that it is good to write things down. When people can't write every word, they have to think about it more. They have to pick out what is important. And the act of writing seems to help them to remember. Studies show that people who write down their notes remember the information better. A new study, done by Princeton University and University of California, found that students who took notes by hand learned more than those who used a computer. In the study, 65 university students listened to the teacher and took notes with pens or computers. Then they did tests about how well they remembered and understood the lesson. Results show that pen users do better than those who take notes with their computers.