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1、Unit 8 A green worldTask&Self-assessment 课时作业一、根据中文提示写出正确的单词。1. （形成）a good habit is very important for our study, work and life.2. You should finish the work with three（步骤）.3. Its important for us to（开发）a green lifestyle.4. Turn off the（电力）when you leave the classroom.5. Dont pour the water away. Yo
2、u can（再使用）it to water flowers.二、用括号中所给单词的适当形式填空。1. They will find it useful（learn） English if they travel abroad.2. Its time for the government（take） action to deal with the waste from those factories.3. We（punish） if we take no action to protect the environment.4. If the medicine theyre testing（wor
3、k） well, more peoples lives will be saved.5. We（make） stricter laws to protect the environment since several years ago.三、句子翻译。1 .你知不知道还有谁会被邀请来聚会？2 .采取这些简单的步骤，我们就可以节约更多的能源。3 .这些垃圾将在回收利用前被分类。4 .未来这个古镇将不允许汽车进入。四、阅读理解。Scientists in Britain and the United States have made a new kind of enzyme（酉孝素）that ea
4、ts plastics（塑 料）.With its help, plastics can be turned into smaller parts and go away quickly. Scientists believe that, in the future, it could solve the problem of plastic pollution.The enzyme is able to break down PET, a form of plastic. PET was first made in the 1940s and is now widely used to ma
5、ke plastic bottles. It can remain in the environment for many years and pollute large areas of land and water. So it has always been a headache to deal with the waste from PET and other plastics.The researchers made the discovery（发 现）while examining the structure of a natural enzyme in Japan. They f
6、ound that the natural enzyme was helping to break down PET plastics. So, they decided to make small changes to the enzyme by adding some amino acids（氨 基 酸）.It made the natural enzymes plastic-eating abilities work faster and better.John McGeehan, one of the lead researchers, said, Weve made an impro
7、ved enzyme. Its better than the naturl one. And we are trying to make more improvements to it. He went on, The enzyme is not harmful to humans or animals,and it is friendly to the environment. So we are considering putting it into wider use.”The team is now trying to make the enzyme break down PET i
8、n large quantities（大量的）.Well see that the plastic pollution may be stopped with this technology. However,there is still a long way to goJohn McGeehan added.1 .According to the scientists, the enzyme may solve the poblem of pollution.A. air B. water C. light D. plastic.The underlined phrase break dow
9、n in the passage probably means in Chinese.A.实验B.生产C.创造D.分解.Researchers discovered that a natural enzyme helped eat plastics .A. in B. in the US C. in Japan D. in China.Which of the following is TRUE according to the passage?A. The scientists are sill trying to improve the enzyme.B. The enzyme will
10、pollute large areas of land and water.C. The natural enzyme woks better than the improved one.D. The natural enzyme is harmful to humans and animals.林景 口一、根据中文提示写出正确的单词。1. Formingsteps2. developpower3. reuse二、用括号中所给单词的适当形式填空。1. to learnto take2. will be punishedworks3. have made三、句子翻译。1. Do you know who else will be invited to the party?2. Take these simple steps and we can save more energy.3. The rubbish will be sorted before it is recycled.4. Cars wont be allowed into the old town in the future.四、阅读理解。DDCA