Many students have hobbies, such as reading, painting, growing vegetables and looking after animals. Some hobbies are relaxing and others are active．Hobbies can make you grow as a person, develop your interests and help you learn new skills.21·cn·jy·com

 David Smith is a student，and one of his hobbies is writing．During the summer of 2010，he spent four weeks at a summer camp．Besides the usual activities，such as sailing and climbing , there was a writing class．"The teacher was a writer, and she asked us to talk about our lives and tell interesting stories. Then she envouraged us to  write about our experiences at the camp,”says David.

 Back at school, David wrote a story about the life of a sixteen-year-old boy, and it came out as a book in 2012. Mang young people love his book, and as a result, David has become a successful young writer.

 David has been very lucky because his hobby has brought him pleasure and success. But writing is not his only hobby. He is also interested in many other things. "I like playing volleyball，too，"says David．"I spend some of my free time playing volleyball for my school team．Maybe I'll write about my volleyball team in my future books.”

C

    Have you ever wanted to achieve something really amazing in life? Well, Greg Mortenson wanted to climb a mountain, but he ended up helping thousands of people to have a better life.

    Greg's story began with failure. In 1993, he set out to climb K2, the world's second highest mountain. But Greg never made it to the top. After five days, he stumbled (踉跄) into the village of Korphe in northern Pakistan, injured (受伤) and hungry. The kind villagers there looked after him for several days.

    Greg saw that the villagers were very poor and hungry, and some of them were ill. Also, the village school didn't have a roof (屋顶) and the children wrote on the ground with sticks. Greg knew he wanted to do something to help. "I'll build you a school, " he told the villagers. "I promise."

    Greg went back home to the USA to raise money for the school. He even lived in the car to save money! Finally he went back to Korphe and built the school. But this was just the beginning of something bigger! Since then, Greg's organization has built around 80 schools and run many others in Pakistan and other countries, too.

    Greg hasn't finished yet. He does many other things to help people in poor countries. He has got many prizes, but it's the smiles of the children he has helped that make him happy!

    Greg has just written a best­selling book about his story called ThreeCupsofTea. It's an interesting and exciting book which tells us what ordinary (普通的) people can do with courage and determination (决心)!

    Garbage collector Jose Gutierrez is 53 years old. When he was young his family was too poor to keep him in school. Jose left school when he was in Grade Two, but that did not stop him having a love for reading.

    Jose said he got the love of reading from his mother. “She read me stories every night,” said Jose. He hopes that every poor child in his city can have books to read. Jose started saving books from garbage twenty years ago. Every day he drives the garbage truck through the city's rich neighborhoods to get old books. Now there are about 20,000 books in Jose's small house. It is already a famous library.

    Books are rare things for children in poor neighborhoods. New books are too expensive. There are nineteen libraries in Bogota, the city where Jose lives, but they are all far from poor neighborhoods.

    Now Jose is famous in Bogota. Many people give old books to him. Jose plans to make more libraries to help more children.

根据短文内容，选择最佳答案。

    Birds live in trees. Squirrels(松鼠) live in trees. But do you know that some frogs（青蛙） live in trees, too?

    The tree frogs are hard to find. They can change color. On green leaves, they stay green. On a branch, they keep brown. Some tree frogs can change from green to gold or blue.

    Tree frogs have legs and wide feet. They have sticky pads (肉趾) at the end of their toes（脚趾）. These sticky toe pads keep the tree frogs from falling off.

    Tree frogs have different colors and markings on their skins(皮肤). Their eyes are different, too. Some have green eyes, some gray. Some frogs' eyes are gold, and some are bright red.

    The sounds they made in spring and summer are different, too. One frog makes a sound like a dog barking(狗叫). Another frog makes a loud noise like a snore（打呼噜）. There is even a frog that whistles（吹口哨）!