The crow （乌鸦） is an ordinary （普通的） bird. It is about twenty inches （英寸） long and black all over. Crows are dirty birds because they live on old bad food. Crows eat a lot of waste food. In this way they are more useful to us than any other bird. They clean up the dirty things in our streets. Crows are always hungry. They look for food all day long, and in the evening you can see them in large numbers flying back to their nests (窝) in the trees. They sleep there at night. Crows are much noisier than other birds. Very often a large number of crows will get together on one house and talk. Sometimes they talk together, and sometimes they do it by talking like human beings (人类). It is easy to tell from(区别) crows' sounds whether they are pleased or angry. Perhaps crows talk a lot because they are friendly birds. A pair of crows will live together all their lives, and if one of them dies, the other one becomes very sad and quiet for the rest of its life and sometimes it dies, too.

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

    Some birds like eating locusts (蝗虫), but birds cannot easily catch them. Why? It is because locusts change their colors together with the change of the colors of crops(庄稼). When crops are green, locusts look green. But as the harvest time comes, locusts change to the same brown color as crops have. Some other pests with different colors from 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 animal life, you'll find the main use of coloring is to protect themselves. Bears, lions and other animals move quietly through forests. They cannot be easily seen by hunters (猎人). This is because they have the colors much like the trees.

    Have you ever noticed an even stranger act? A kind of fish in the sea can send out a kind of very black liquid (液体)when it faces danger. While the liquid spreads over (散开), its enemies (敌人)cannot find it. And it immediately swims away. So it has lived up to now though it is not strong at all.

Liu Yaxuan is totally a homebody. Every weekend, this 14-year-old student from Tsinghua High School watches popular TV dramas and plays with her mobile phone. She hates playing outdoor sports."It's too tiring,"she said.

She is not alone. In recent years, more and more Chinese teenagers are becoming homebodies. A 2013 survey of kids aged 2 to 14 showed about half of them spend less than one hour doing outdoor activities every day.

To some extent, heavy academic pressure (学业压力) caused this situation. Hu Huilan, 12, from Shenzhen Nanshan Language School, is busy with piles of homework and extra classes on weekends."I don't want to get behind,"she said.

Even if this isn't a problem, kids still prefer indoor life. Wang Yidi, 12, from Anhui No. 50 Middle School, often reads Harry Potter, listens to music and surfs the Internet at home."I can do so many things I like at home rather than hang out in smoggy weather,"she said.

But this causes bad health conditions. Chinese teenagers' physical conditions have been dropping for about 28 years, reported a newspaper last year.

The situation for teenagers should be changed. They should spend their free time outdoors even if it just means going to the park or reading a book under the tree. Nice weather, little homework and rich outdoor activities enable them to do that. It helps them stay energetic.

My dear friends, let me tell you something about my daily timetable. I1 at 7:00 and I go to2 at 8:00.I have science at3 and then I have math at 10:00.4 is my favorite subject. I like math because it's5 .Mr. Huang is our math 6 .I like him very much. I eat7 at 12:00 and then I have music at13:00 .I have history at14:00. I8 like history because it is boring. But I9 like art and I want to be a(n)10 . I have art on Wednesday.

Do you know what the greatest invention ( 发明) is in the 20th century in Japanese eyes? Ramen!

Ramen is a kind of cheap and good yellow noodles that became popular street food in Japan in the early 1900s because Japanese did not have much food at that time. Today people all over the world enjoy ramen. It is said that people around the world eat about 40 billion bowls of ramen every year! Now ramen is moving from streets and instant bowls to good restaurants. Some cooks add meat, vegetables and spices( 调味香料 ) to make ramen more delicious. And people in Japan like to go to noodle shops or sushi(寿司) bars to have a nice dinner now. So whether you want traditional, quick, or fancy ramen, you can always find it. Just look on the street, in a store, or in a restaurant near you.

 There are four people in my family. For me, family is where life begins and love never ends. So I like {#blank#}1{#/blank#}(花费) time with my parents and my brother. My father is a doctor. He has so many things to do in his work. I can only {#blank#}2{#/blank#}(遇见) him at weekends. He has many {#blank#}3{#/blank#}(爱好), so life is never {#blank#}4{#/blank#}(无聊的) with him. Weekends are really the most wonderful time to stay {#blank#}5{#/blank#}(一起). I like to see my mother cook. It feels like {#blank#}6{#/blank#} (魔术) and it's really fun. My parents often tell me not to use the {#blank#}7{#/blank#}(智能的) phone too much, it's bad for my eyes. So this {#blank#}8{#/blank#}(学期),I want to join a club. I hope to learn to play the {#blank#}9{#/blank#}(吉他). My brother is only six years old. He often {#blank#}10{#/blank#} (收集) insects in our backyard.