Have you seen Avatar(《阿凡达》)? It's a popular3Dflm, and you may have to wear 3D glasses to see it. The 3D glasses make the images(图像) from the film look as if they are coming straight towards you.

    More and more 3D films are coming to theatres. Some say that 3D TV sets will come into our homes in the near future. 3D technology can make TV and films more exciting. However, people with eye problems may get headaches if they spend too much time watching 3D films. Why?

    When we look at an object(物体), each eye sees it at a different angle. Our eyes send the two images to our brain(大脑), and the brain puts them together. 3D technology uses two film projectors(投影机). One projects a left—eye image and the other projects a right—eye image. 3D glasses allow us to see a different image in each eye. So, when we are watching a 3D film, our brain can't put together the images. The brain needs to work harder at reading "the images. That makes it easier for people with eye problems to get dizzy(头晕的) or have headaches. A famous eye doctor said if your eyes can't focus(聚焦)on the same object at once, you will have trouble watching 3D films.

    Recently, many people have begun to try a new way of shopping through the Internet. They are very interested in it. Why is it becoming more and more popular now? There are some reasons. First, more and more people have their own computers and their computers can be joined with the Internet. So it is possible for many of them to do some shopping through the Internet. Second, shopping through the Internet can save some money and a lot of time. Third, they don't need to go to the shop themselves, Because of these good facts, few people refuse it.

However, some people don't like this new way of shopping. They are worried about the safety of shopping online, Customers can only see the pictures of a product on the Internet. And they can't enjoy the pleasure of buying things in a large supermarket or a wonderful shopping centre. These are the reasons why they do not like it.

    But I think more and more people will like this new kind of shopping in the future.

—Because my little sister _______ in the room. My mum spent a lot of time cleaning it.

Vision—phones(可视电话)

    Many inventions are very useful in our daily life. They have greatly changed our life. For example, radios, telephones and televisions are widely used in the world. When you turn on the radio, you can listen. But when you use the telephone, you can not only listen to others but also chat with them. However, you can't see anything at all. The television is much better than both of them. People can watch TV and listen to it, but they can't take part in what they see.

    Today, some people are using a type of telephone called the vision phone. With it two people can see each other when they are talking

    Vision-phones can be of great use when you have something to show the person when you are calling him or her. It may also have other uses in the future. Some day you may be able to call up a library and ask to read a book over your vision-phone. You may be able to do some shopping through it too. Perhaps in the future, the vision-phone will come into wide use in our everyday life.

    Thomas Edison lit up the world with his invention of the electric light. Without him, the world might still be in the dark. However, the electric light was not his only invention. He also invented the motion picture camera and more than 1, 000 other things. About every two weeks he created something new.

    Thomas Edison was born in 1847. He attended school for only three months. His mother taught him at home, but Thomas was mostly educated. He started experimenting at a young age.

    When he was 12 years old, he became a newsboy on a train. experiments on the train in his spare time. Unluckily, his first work experience did not end well. They fired him when he accidentally set fire to the floor of the train. Then Edison worked for more than five years as a telegraph operator, but he continued spending much of his time in experimenting.

    Thomas Edison was totally deaf in one ear and hard to hear others, but he thought of his deafness as a blessing in many ways. It kept conversations of every 24 hours. Sometimes his wife had to remind him to sleep and eat.

    Thomas Edison died at the age of 84. He left a great many inventions that greatly improved the quality of people's life all over the world.