Look at the centre circles of Diagram (图)A and Diagram B. Which of the centre circles looks larger? In fact, they are exactly the same size.
Then look at the picture on the right. What do you see? A vase? Or two faces？Does the picture change quickly from one to the other again and again? Maybe or maybe not, but you can never see them at the same time.

“What's happening? Is something wrong with my eyes?” You may wonder at what you see. Don't worry. Here is how it goes:
When we look at things, our eyes send messages to our brains and then our brains interpret（解读）the information. However, sometimes our brains interpret the received information in a wrong way. It seems that our eyes are playing a joke on us. This often happens and we call it “visual illusion(视觉错误)”.
Movie makers often make use of visual illusions. They make the objects around actors much smaller or bigger than usual. This makes us believe that the actors are much larger or smaller than they usually are. The movies Jurassic Parkand Honey I shrunk the kids just make use of visual illusions.

    Many people know that rubbish is a big problem on planet Earth. What many people don't know is that junk (垃圾) has become a problem in outer space too.

    According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. Andtheseare just the things that we can see from the surface of the earth by telescopes (望远镜). There are also millions of smaller pieces of junk that we can't see.

    Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage the vehicle.

    To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U. S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.

    To reduce additional space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth's atmosphere after that time. In the upper parts of the atmosphere, it will burn up.

    Many scientists are also suggesting different ways to clean up space junk. In England scientists are testing a metal net that can be fired into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely destroyed.

    "The problem is becoming more challenging because we're sending more objects into space to help people use their mobile phones and computers," says Marco Castronuovo, an Italian space researcher.

    "The time to act is now. The longer we leave the problem, the bigger it will become," he says.

Some people are very careful about everything they do. On the other hand, some people, especially teens, do things without thinking too much about the results. Why is this? 

Anna, a psychologist uses computer games to find out why some people are more likely to take risks. In one game, players are asked to click(点击) on a balloon on a computer screen. Every time they click, the balloon gets bigger. The bigger the balloon is, the larger the prize will be. But if the balloon gets too big, it'll be broken and the player will get nothing. 

Anna found that when teens played this game, a part of their brain called the striatum (纹状体) would become more active. It makes teens want to win. Another part of the brain, the prefrontal cortex (前额皮质), helps them control their decision-making process. 

It turns out that young people have more striatums and less prefrontal cortexes, which affects their ability to make careful decisions. You might have already guessed that teens break more balloons during the game than adults – mainly because they like to take risks more and don't take the time to think carefully. 

"The teen brain is like a car with a very strong engine, " Anna said. "Its brakes (刹 车) just don't work as well. "

注意：（1）可在思维导图内容提示的基础上适当拓展信息。（2）不能照抄原文：不得在作文中出现真实校名、地名和考生的真实姓名。（3）语句连贯，词数 80 左右。作文的标题和开头已经给出，不计入总词数

Shunde，the place I live in.

Dear readers，let me tell you something about Shunde，the place I live in.

……

Chicago is the third most populous(人口众多的) city in the US, with a population of about 2,700,000. Its other famous name is "The Windy City". It is for a good reason. The city lies right next to Lake Michigan and heavy winds blow through the city. 

Chicago is famous for its art and culture (文化). In order to know the art and culture, you must pay a visit to the Art College of Chicago. It is not only a school, but also a world- class art museum. If you don't want to visit a museum, you can take some special photos. Then your best choice is to take photos at the Cloud Gate. Chicago has lots of fun things to do. If you enjoy heights, visit the famous Willis Tower! You can go up to the top of it and walk onto a glass box. You'll be standing over the city, but don't worry— It's completely safe. Doesn't Chicago sound like a fun city?

The Greens like shopping on the Internet. They all think it's easy and fun to shop on the Internet.

Mr. Green likes reading books. He usually buys new books on the Internet. But sometimes he is too busy and has no time to look for books he wants. So his daughter Lucy often helps him to buy books.

Mrs. Green likes beautiful clothes. She always watches new skirts or dresses in clothes shops first and then buys some of them on the Internet. Of course, they are cheap. But sometimes she is upset because many other women wear the same clothes as her!

Lucy likes listening to music. She often buys CDs on the Internet. They are usually cheap. But the only problem(问题) is that some CDs sound(听起来) a little bad.

Eric buys many things on the Internet, from school things to toys. Sometimes his parents think he always spends too much money on shopping!