中小学教育资源及组卷应用平台
Unit 8 A green world
Task&Self-assessment课时作业
1、根据中文提示写出正确的单词。
1. (形成) a good ( http: / / www.21cnjy.com )habit is very important for our study, work and life.21*cnjy*com
2. You should finish the work with three (步骤).
3. It’s important for us to (开发) a green lifestyle.【出处:21教育名师】
4. Turn off the (电力) when you leave the classroom.21教育名师原创作品
5. Don’t pour the water away. You can (再使用) it to water flowers.
2、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. It’s time for ( http: / / www.21cnjy.com )the government (take) action to deal with the waste from those factories.
3. We (punish) if we take no action to protect the environment.【版权所有:21教育】
4. If the medic ( http: / / www.21cnjy.com )ine they’re testing (work) well, more people’s lives will be saved.
5. We (mak ( http: / / www.21cnjy.com )e) stricter laws to protect the environment since several years ago.
3、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。
.
4、阅读理解。
Scientists in ( http: / / www.21cnjy.com ) Britain and the United States have made a new kind of enzyme(酵素) that eats 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.2-1-c-n-j-y
The enzyme is able to ( http: / / www.21cnjy.com )break down PET, a form of plastic. PET was first made in the 1940s and is now widely used to make 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 ( http: / / www.21cnjy.com )the discovery(发 现) while examining the structure of a natural enzyme in Japan. They found 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 enzyme’s plastic-eating abilities work faster and better.
John McGeehan, one of ( http: / / www.21cnjy.com ) the lead researchers, said, “We’ve made an improved enzyme. It’s 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 tryin ( http: / / www.21cnjy.com )g to make the enzyme break down PET in large quantities(大量的). “We’ll see that the plastic pollution may be stopped with this technology. However,there is still a long way to go,”John McGeehan added.21教育网
1.According to the ( http: / / www.21cnjy.com ) scientists, the enzyme may solve the poblem of pollution.
A. air B. water C. light D. plastic
2.The underlined p ( http: / / www.21cnjy.com )hrase “break down” in the passage probably means “ ” in Chinese.
A. 实验 B. 生产 C. 发明 D. 分解
3.Researchers discovered that a natural enzyme helped eat plastics .21cnjy.com
A. in B. in the US C. in Japan D. in China
4.Which of the following is TRUE according to the passage 21·世纪*教育网
A. The scientists are sill trying to improve the enzyme.www-2-1-cnjy-com
B. The enzyme will pollute large areas of land and water.21*cnjy*com
C. The natural enzyme woks better than the improved one.www.21-cn-jy.com
D. The natural enzyme is harmful to humans and animals.【来源:21cnj*y.co*m】
答案
一、根据中文提示写出正确的单词。
1. Forming
2. steps
3. develop
4. power
5. reuse
二、用括号中所给单词的适当形式填空。
1. to learn
2. to take
3. will be punished
4. works
5. have made
三、句子翻译。
1. Do you know who else will be invited to the party 21世纪教育网版权所有
2. Take these simple steps and we can save more energy.21·cn·jy·com
3. The rubbish will be sorted before it is recycled.2·1·c·n·j·y
4. Cars won't be allowed into the old town in the future.【来源:21·世纪·教育·网】
四、阅读理解。
DDCA
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