We know the earth is a planet．There are seven other planets，and they go  1 the sun together．The eight planets and the sun are2 the solar system．The first planet，3   the sun，is Mercury(水星)．It is 58 miIlion  4  from the sun．Venus(金星)is the second planetfrom the sun，and  5 planet，the earth，is the third．It is from the sun,and 55  planet,the earth,is the third.It is 2,650 million kilometres from the sun．

    Jupiter(木星)，Saturn(土星)，Neptune(海王星)and Uranus(天王星)are all 6 than the earth，7 Venus，Mars and Mercury are smaller than the earth．

    Animals，trees and humans can only 8  on the earth，because the other planets in our solar system don't  9  air or water．Do any  10planets in   solar systems have life?We don't know about it．

    Christmas is coming.1 you are thinking what gifts you need to buy, the Alice Ferguson Foundation is busy 2 the environment by building relationships between people and nature.

    At the 3 of the year, it designs events to help children celebrate Christmas without increasing the amount of 4 they create.

    Hanna Seligmann who works for the foundation, said they 5 that from Thanksgiving Day to New Year's day, the household trash increases by 25 percent. Many young people do not know the6 they throw away do not decompose (分解), or break down, at the same rate. For example, paper dissolves（溶解） in about four weeks. A metal can take up to 100 years. A plastic bag will not decompose for 450 years. Glass takes 1,000 years.

    Hanna Seligmann shows adults and children 7to reduce waste during the holiday gift-giving season.

    She encourages using things that are 8 in our houses like newspaper or old magazines. With imagination，children can wrap gifts in a 9 napkin or even a beautiful scarf. In fact，there's no better way to celebrate the holiday by giving10to the planet.

    There was a small village near the mountain. There were a lot of trees in the mountain. People in the 1always got something from the mountain, such as animals and trees. When they wanted to 2a house, they cut down the trees. And they also killed the animals for 3. Trees were very 4in their daily life. They made tables, chairs 5beds by cutting down the trees. In addition, when they 6meals, they still used some trees for wood. However, they only cut down trees but 7planted new trees. So the trees were fewer and fewer and the animals were becoming 8as well.

    One summer, it rained 9in the village. The rain lasted for about a week. The soil and the stones on the mountain fell down and soon 10the whole village. They finally realized they couldn't only cut down trees but also needed to protect them.

    When talking about inventors, who do you first think of? Forget Thomas Edison. Meet the teenage 1 at the 24th Jiangsu Adolescents Science &. Technology Innovation Contest(江苏青少年科技创新大赛).

    Wang Xingyu, from Kunshan No. 2 Middle School, invented "a 2 line" in the zebra crossing. Wang often saw people running through

the red 3 , so he thought of an idea,

    "I 4 a spray tube(喷管) in the zebra crossing. When the light is red and 5 crosses, it sprays water. If the light is 6, it will not work," said Wang.

    But does it 7 water? "There's a water channel(槽) on the ground, so the water will be collected and 8 again," he said. Zong Hangchen, from Nantong Special Education Middle School, also got his invention idea from daily experience.

    Zong's 9 could only feel a little light. When he walked on the sidewalk for the blind, he often came across obstacles(障碍物). Once he 10 hurt his nose.

    11 help himself and the blind, Zong made something that has radar(雷达) and a loudspeaker. Users tie radar onto their knees and 12 the loudspeaker around their necks. When they meet obstacles, the radar will see them and the loudspeaker will make a 13 to tell the users.

    Chen Huijuan, an official from Jiangsu Association for Science and Technology, was 14 at these inventions.

    15 some ideas are simple, the creations are very good," she said. "Get inspiration( 灵感) from small things in life and you can be an, inventor, too.

    Many people like to see animals in the zoo. But do you know most of the animals in the zoo are very 1? Animals usually live in the forests or mountains. They like to live 2. But the life in the zoo is quite 3 from that in the forests and mountains. They have to stay in cages all day and wait for the zoo 4 to feed them. They can't come out of the cages. So they have to walk round and round.

    The wildlife park can solve all these 5 for them. All the animals live in the open air everywhere in the 6. They 7 stay in cages. They can run, jump and play with other animals happily. The most important thing is that they are free and happy, and they are protected there. People are not allowed to hunt in the wildlife park.

    Some of the animals in wildlife parks are friendly, but some are fearful, such as lions, wolves and tigers. But it's not dangerous 8 the animals in wildlife parks. You can take a bus to see the animals. It will be very 9 if a tiger or a bear looks at you through the window. But don't worry. 10 will happen. You are quite safe inside the bus.