When you watch 3D movies or TV, you have to wear a special pair of glasses. The 3D glasses make the images from the screen look like they are there in the room with you.

    Three-dimensional, or 3D, means having three dimensions（维度）: width, height and depth. 3D technology（技术） is based on the way the human brain（大脑） and eyes work. Because the pupils of a person's eyes are about 6.5era apart（分开）, when we look at something, each eye sees,it from a different angle（角度）. Our eyes send the two images to our brain, and the brain puts them together. The small difference between the image from the right eye and the image from the left eye allows us to see depth.

    When we view pictures and television in two dimensions, each eye gets the same information. That is because the image has no real depth, and there is only one of viewing it. So the goal of 3D technology is to get a different image into each of the viewer. It uses two film projectors. One projects a left eye image and the other projects a right image. The 3D glasses allow us to see a different image in each eye.

    While watching 3D films, we feel that we are in the same environment as the things we're watching. However, it also has its disadvantages. The 3D glasseswork by controlling the amount of light that reaches the eyes. It makes the screen look darker. What's more, people with eye problems may get headaches if they spend too much time watching 3D movies，because their brains need to work harder to "read" the images.

    How much do you know about Albert Einstein?

    Albert Einstein, born on March 14, 1879 in Germany, was a great scientist in the world. ①He was strange because he hated haircuts and new clothes. He believed in peace. All his life, he hated war. However, his most famous idea, E = mc², helped create the world's most dangerous weapon (武器). Many people think he was the smartest person in the world. But Einstein said that he thought like a child with many questions and unusual ideas.

    What did he like?

    Einstein liked learning sailing (帆船运动). He sailed in small boats all his life. He once joked, “Sailing is the sport that takes the least energy!” When Einstein was a child, his mother made him take violin lessons. At first, he didn't like the violin. But then he learned to love music and became a good violinist.

    Later, he said, “②热爱是最好的老师。”

    Why is the sky blue?

    In 1910, Einstein asked a question which many children often ask, “Why is the sky blue?” After his careful research, he answered the question like this: “It's because light is made up of many colors including blue. When light travels to Earth, gas particles (气体微粒) spread the blue light all over the sky.” His answer is true in physics.

    Mr. Green made a robot. He could say only one sentence—“There is no doubt (疑问) about it.” The robot always repeated the same words when you spoke to him.

    One day, Mr. Green needed lots of money and he took the robot to the market to sell him. “Who will buy my robot? He is very smart,” he shouted, “Twenty thousand dollars for my robot!”

    A man was surprised that he was asking for so much money. Instead of asking Mr. Green why he wanted so much money, he decided to speak to the robot. “Are you worth (值) twenty thousand dollars?” he asked the robot. “There is no double about it,” answered the robot.

    The man liked the robot's answer so much that he bought him and carried him home. But very soon he found that the robot could say nothing else. He was sorry he bought the robot. He stood in front of the robot and said, “How foolish I was to throw so much money away！”

    “There is no doubt about it,” said the robot.

    Mr. and Mrs. Scott want to buy some new chairs for their new house. They come into a shop and see some very good chairs on the floor. They like the colour and want to know how much they are. They see a price tag (标签) on one chair. It says (上面写着) "￥100". They like the chair but they are too dear (贵) for them. The Scotts don't think they can buy them now. They leave this shop and go to other shops. Mr. Scott thinks they can find some cheap chairs.

On the day of the interview, I got up at 6:00 in the morning. I got to the interview place without having1. l was the 24th interviewee(应聘者) and the 22nd was a short ordinary- looking girl. I greeted her by2my head. I asked her where she graduated. She told me in a low3, "I graduated from a junior college， the only one without getting a bachelor' s degree(学士学位) among the 50 interviewees.

I didn't4he interview would last so long. As I didn't have breakfast, my stomach started to ache. I had to sit by the table for a5. Just at that time, the girl asked me6happened, I told her, "I didn't have breakfast this morning, so my7comes to me.

    After a while, a worker came in and8me a bottle of milk and a piece of bread. It was certain that they were bought by the girl. I felt9all over my heart because I hadn't imagined she would be so nice to help me- her rival(竞争对手).

Luckily, I got the job. The first day I went to work, I was10to see the girl there. She also got the job. Later I asked her why she got the job. She said11a smile, "That day when I bought you the12, an interviewer went to the toilet with papers in hands. He asked me13I could help him to copy those papers while he was in the toilet. I helped him. After I came back to him, he asked me why I took the food in hands. I told him the14. Then I got the job." At that moment, I came to know that when the girl helped me and the interviewer, she also helped15.

    Helping others will benefit yourself as well.