Do you know why different animals or pests have their special colors? Colors in them seem to be mainly used to protect themselves.

Some birds like eating locusts (蝗虫), but birds cannot easily catch them. Why? It is because locusts change their colors with the change of the colors of crops. When crops are green, locusts look green. But as the harvest time comes, locusts change into the same brown color as crops have. Some other pests whose colors are different form plants are easily found and eaten by others. So they have to hide themselves for lives and appear only at night.

    If you study the animals' life, you'll find the main use of colors is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters because their colors are much like the trees.

    Colors are useful not only on the land, but also in the sea. A kind of fish in the sea can give out a kind of black liquid (液体) when the fish face danger. The liquid spreads over quickly, so they cannot be found by their enemies and can quickly swim away. That is why they live safely though they are not strong at all.

D

    When a computer works on a group of programs, it can get very hot. Cooling the computer can cost a lot. So some scientists wonder what would happen if the heat from the computer could be used.

    Large Internet companies (公司）such as Google and Microsoft have thousands of computers. As these computers deal with information, they produce lots of heat, so they need huge cooling systems(系统）. These systems send the heat into the air.

    A company in Holland(荷兰） thinks paying to make the computers work and then paying again to cool them are a waste of energy. So the company developed a special device—the e-Radiator.

    Boaz Leupe, head of the company, says the e-Radiator works as a heating system and saves money. He explains that the energy is used twice—once to heat the home and once to cool the computer and that the users don't have to pay to cool their computers.

    Five homeowners in Holland are testing the heating system in their homes.

    "We pay for the computer using, so, in that way, homeowners get heating for free," Boaz says.

    Jan Visser is one of the homeowners. "If you use the computer more, the e-Radiator produces more heat," he says. "It can't provide enough heat if you don't use your computer often." But he is ready to try it. It's a great help for his family.

    The company says e-Radiators produce heat temperatures of up to 55℃. It says the system could save its users about $440 a year.

    Many animals hide to stay alive. They hide in many ways. Some animals hide in leaves; some animals hide in snow. Usually their colors or shapes help protect them. It's hard to see an Arctic bear in snow. Its white fur helps protect it. Chameleons(变色龙) can hide by changing colors. Their skin turns the same color as what is around them. Some chameleons can change colors in five minutes.

    Many animals try to look bigger than they are to stay alive. Some animals can make other animals think they are very big. If they look very big, animals that are looking for food will run away. Bears can walk on two legs. They look very, very scary. Some animals will run away from them.

    Many animals try to stay around other animals. This helps them stay alive. Zebras stay close together so that they can help each other look out of danger. Seeing many stripes at once can also confuse animals that want to eat them. Some birds stay in a circle, each toward a different direction. In this way they can also help each other stay alive by looking around for animals that many want to eat one of them.

{#blank#}1{#/blank#} (I) name is Xu Kun. I'm a {#blank#}2{#/blank#} (China) boy. I'm twelve. I {#blank#}3{#/blank#} (be) from Dalian. Dalian is a big city. I'm at No. 2 Middle School. {#blank#}4{#/blank#} (we) school is a very good one in Dalian. I'm in Class One Grade Seven. There are 48 {#blank#}5{#/blank#}(student)，25 girls and 23 boys. Ms Lin {#blank#}6{#/blank#} (be) our English teacher. She is from {#blank#}7{#/blank#} (American). She is nice to me. I like English very much. And I'm good at it. LiXia is good at English too. Weare good {#blank#}8{#/blank#} (friend). My father is an English teacher. My mother is a Chinese teacher. My mother and I {#blank#}9{#/blank#} (be) in the same school. {#blank#}10{#/blank#} (our) love our school.

    September 10th is Teachers' Day in China. It is a special and great f{#blank#}1{#/blank#}. A lot of students celebrate this day with their t{#blank#}2{#/blank#}. Teachers work very hard all the time in a year. O{#blank#}3{#/blank#}this day they can have fun. Which teacher is your f{#blank#}4{#/blank#}one? What present can you get r{#blank#}5{#/blank#}for your dear teachers? Floweror any little p{#blank#}6{#/blank#}? Your teachers are h{#blank#}7{#/blank#}to get your beautiful presents. Let's say "Happy Teachers' Day to our dear teachers t{#blank#}8{#/blank#}.

These is a photo of Paul's family. The boy is {#blank#}1{#/blank#}Paul. He is America. Now he is in China with {#blank#}2{#/blank#}his parents. His father is a English teacher at a {#blank#}3{#/blank#}school. His mother is a manager. Her works in {#blank#}4{#/blank#}a big company (公司) . His elder brother Martin is in the front of them. He is a bus {#blank#}5{#/blank#} drive. He is busy (忙碌的) every day. Paul's {#blank#}6{#/blank#}sister is next at him. She works in a hospital. {#blank#}7{#/blank#}She is a doctor. There is a cat in them family. {#blank#}8{#/blank#}Its name is Kitty but it is very lovely (可爱的) . {#blank#}9{#/blank#}They all love it. Paul's grandparent are in {#blank#}10{#/blank#}America. They have a big farm there.