Unit 2 Plant a Plant.Lesson 8 Why Are Plants Important?课件+练习

Lesson 8　Why Are Plants Important？ 一、单项选择 1. —What can you see _____ the tree —Aha! Koalas! Seven of them! A. on B. in　 C. above D. over 2. Thanks to our teachers. _____ their help, we couldn't make such great progress. A. Without B. With C. About D. For 3. The Monkey King can turn himself _____ seventy two different animals and objects. A. down B. on C. off D. into 4. She told us that by the end of the year, she was very _____ about the bullying(欺凌) and became ill. A. pleased B. worried C. satisfied D. amazed 5. —Our head teacher is responsible for his work. He spends most of his time with us. —_____ He always communicates with our parents in his free time. A. I hope so! B. What C. That's for sure. D. Why 6. Summer camping is a great experience for students. It is good to help them _____. A. wake up B. get up C. hurry up D. grow up 7. It's bad for your eyes _____ computer games too much. A. play B. playing　 C. to play D. plays 8. Kaili is one of the most beautiful _____ in Guizhou. A. place B. cities　 C. town D. county 9. The scarf which is _____ silk _____ soft and comfortable. A. made from；feel B. made of；feels C. made in；smell D. made up of；smells 10. Are there many trees _____？ A. where do you meet B. where you meet C. you meet where D. you meet there 二、连词成句 11. play, the, under, shall, tree, we _____ 12. fulfill, basic, what, needs, our, can _____ 13. a, it's, have, pleasant, trip, to _____. 14. ways, help, in, trees, many, people _____. 15. look, confidence, you, beautiful, makes _____. 三、阅读理解 (词数：约260；建议用时：6分钟) Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion. There are many people to feed. We need more and more food. One way to produce more food is growing stronger plants. For thousands of years, farmers have made plants better. Every season, they pick the best plants for the next season. It works very slowly. Since 1983, scientists have been able to change plants more quickly by changing their genetic(遗传的) material. Foods from plants grown in this way are called genetically modified (转基因的) foods, or GM foods. By changing the genetic material of a plant, it is possible to make new plants. Scientists make plants which are strong against plant diseases (疾病). They can also help in our diseases: a kind of rice will be grown, for example, which stops people becoming blind. Rich countries produce GM foods because they are easy to grow and bring in more money. Poor countries are interested in them because they help produce more food. GM plants are not natural. No one knows how good or bad they are. Making GM foods is only one way of feeding people in 2050.There are strong feelings against them because they are unnatural. They may feed people, but then hurt them or their children later. But both rich and poor countries are interested in their uses, and they are not going to go away. In 2050, we may think differently about them. 16. There may be ____ ... ...