Scientists in 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.
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 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 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 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 trying 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.
1.According to the scientists, the enzyme may solve the poblem of pollution.
A. air B. water C. light D. plastic
2.The underlined phrase “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 .
A. in B. in the US C. in Japan D. in China
4.Which of the following is TRUE according to the passage?
A. The scientists are sill trying to improve the enzyme.
B. The enzyme will 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.
1.D 2.D 3.C 4.A 【解析】试题这是一篇科普文，介绍了英国和美国科学家研制出的一种新的酶，可以帮助解决塑料污染的问题。 1.题意：根据科学家们的说法，这种酶可以解决 污染的问题。考查细节理解题。根据Scientists believe that, in the future, it could solve the problem of plastic po...
新思维假期作业暑假吉林大学出版社系列答案
蓝天教育暑假优化学习系列答案科目：初中英语 来源：八年级下 Unit 9 Have you ever been to a museum 测试卷 题型：阅读单选
One day, a woman walked into a pet store to buy a bird for her Thanksgiving Day party. The guy said, “We only have one parrot. But I think you do not want it because it can talk…”
The woman said happily, “That’s great. I’ve always wanted a talking bird.”
So the guy said, “Since you are a nice lady, I’ll give it to you as a gift.”
And the lady went home and put the bird on her bed and walked out of the room. But as soon as she walked into the kitchen, the bird started to speak dirty words as loud as it could. The woman walked back into the room thinking, “I can’t have this at my party!” So she took the bird and put it in the fridge.
A few hours later, while the woman was eating, she remembered that her bird was still in the fridge. Quickly, she opened the door and found it was shivering. Then she took out the bird at once. She said to the bird, “I’ll keep you out of there if you don’t use that language again. Do you agree with me?”
The bird nodded and asked, “Can I just ask a quick question?” The lady nodded and said, “Yes, you may.”
The bird pointed at the turkey behind him and asked, “What did he do?”
1.The woman went into the pet store because___________.
A. she wanted to buy a bird for Thanksgiving Day party
B. she wanted to buy a bird to make a big meal
C. there were lots of nice birds in it
D. she wanted to buy a bird for his son’s birthday
2.The woman got the bird___________.
A. by paying the guy some money
B. by taking it away without telling the guy
C. by giving the guy nothing
D. by asking the guy to give her
3.The woman put the bird in the fridge because____________.
A. she wanted to cook it on Thanksgiving Day
B. she thought it’s the best place for it to live in
C. the bird liked living in the cold place
D. the bird spoke dirty words
4.The underlined word “shiver” means____________.
A. 睡觉 B. 发抖 C. 生气 D. 跳动
5.The bird wanted to know_____________.
A. why the turkey was in the fridge
B. why itself was in the fridge
C. who could be in the fridge
D. how the turkey was put into the fridge
1.A 2.C 3.D 4.B 5.A 【解析】 文章讲述了一个太太买了一只会说话的鸟的故事。 1.根据One day, a woman walked into a pet store to buy a bird for her Thanksgiving Day party可知她想为感恩节聚会买一只鸟；故选A。 2.根据So the guy said...查看答案和解析>>
科目：初中英语 来源：北京市怀柔区2018届九年级第二次模拟考试英语试卷 题型：单选题
—Must I return this book tomorrow?
—No, you ________. You can keep it until next week.
A. can’t B. mustn’t C. needn’t D. shouldn’t
C 【解析】句意：——明天我必须归还这本书吗？——不，你不需要，你可以借到下周。A. can’t 不能，不可能； B. mustn’t 必须不能； C. needn’t不需要； D. shouldn’t不应该；根据must引导的一般疑问句，表示必须时，否定回答用needn’t；故选C查看答案和解析>>
科目：初中英语 来源：人教八年级下英语Unit 5 测试卷 题型：单选题
The boy with two dogs ________ in the yard when the earthquake hit the city.
A. is playing B. are playing C. were playing D. was playing
B 【解析】 根据时间状语从句可知主语为过去进行时态，主语为这个男孩，第三人称单数，故选B.查看答案和解析>>
科目：初中英语 来源：重庆市2018年中考英语试卷 题型：语法填空
As we are growing up, we really need advice from adults. Here are three people talking about their experiences.
Jasper,26, actor
You’re not alone.
Sometimes when you’re a teenager, you feel as if you’re all alone and there’s 1. you can talk to. Do you know twenty to thirty percent of teenagers in the US have a hard 2. going through the period? They feel lonely and sad. I think life is so much easier if you 3.your troubles with others. I regret that I didn’t take the advice when someone gave it to me.
Steve,27, teacher
Your teachers only want what’s best for you.
When I was in school, I never thought I’d become a teacher. I acted badly in class, and I fell4. about that now. I love my job and I know how challenging it is, so I hope kids can show their teachers more respect(尊 重). I hope kids can5. that teachers push them to do their best and not just to give them a hard time．
Anna,29, doctor
Money doesn’t grow on trees.
When I was a teenager, I never learned 6. to save money. I just spent it! My parents gave me everything I wanted, but I realize now they spent little7. themselves. Now I wish I know more aboutmoney planning even less 8. me years ago. I do wish they could learn about it earlier.
1.nobody 2.time 3.share 4.sorry 5.understand 6.how 7.on 8.than 【解析】试题短文列举了三个不同职业的人，谈论他们的成长经历，表明随着自己的成长，我们很需要来自大人的建议。 1.句意：有时当你十几岁的时候，你会觉得自己很孤独，没有人可以跟你说话。you can talk to做空格的定...查看答案和解析>>
科目：初中英语 来源：重庆市2018年中考英语试卷 题型：单选题
The 2022 Winter Olympic Games in China． I’m sure it will be a great success.
A. hold B. will hold C. were held D. will be held
D 【解析】句意：2022届冬季奥运会将在中国举行，我相信这将是一个巨大的成功。考查被动语态。The 2022 Winter Olympic Games是动词hold的受动者，需用被动语态，即be+过去分词结构。2022年是将来的时间，需用一般将来时。根据句意结构，可知选D。查看答案和解析>>
科目：初中英语 来源：重庆市2018年中考英语试卷 题型：单选题
It was raining. My father asked me a raincoat.
A. take B. takes C. took D. to take
D 【解析】句意：天在下雨。我父亲让我给他买件雨衣。考查动词形式辨析题。ask sb. to dosth.要求/告诉某人做某事，固定短语；根据句意语境，可知选D。查看答案和解析>>
科目：初中英语 来源：2018年江苏省连云港市中考英语试卷 题型：单选题
—Do you know ?
—On July 15th. So after the exam, you can enjoy most of the matches.
A. when will the 2018 Football World Cup end
B. when the 2018 Football World Cup will end
C. where will the 2018 Football World Cup be held
D. where the 2018 Football World Cup will be held
B 【解析】句意：——你知道2018年足球世界杯什么时候结束吗？——在7月15号，考试以后，你可以欣赏大部分比赛。这是疑问词引导的宾语从句，用陈述语序，排除A/C；根据On July 15th，可知问什么时间；故选B查看答案和解析>>
科目：初中英语 来源：浙江省2018年湖州中考英语试卷 题型：阅读单选
Workers wear them. Swimmers wear them. Scientists wear them. Woodcutters wear them. People who play sports wear them. Goggles protect the eyes. They keep out water and chemicals. They keep out bits of wood or stone. They might look funny, but goggles do serious work!
Why do people need to wear goggles? They need to keep their eyes sasfe. Many things can hurt our eyes. Have you ever gotten a piece of sand or dirt or other small particle in your eye? What happens? It hurts. Your eye begins to fill with tears. Those tears are your body’s way of getting the sand or dirt out of your eye. Sometimes this works. Your eye feels much better.
But what happens if your tears don't work? What happens if the piece of sand has gotten stuck in your eye? Eyes are delicate. They can be scratched or cut easier than skin(皮肤). If the particle is not washed out by tears, you might have to go to the doctor. You could even have problems seeing out of that eye.
Instead of waiting to see if tears will help, some people use goggles. This can prevent things from getting in their eyes at all. If they use goggles. their eyes are protected from the things that can cause problems, Goggles are a better way to protect eyes. They are made of plastic or glass, and they are tied around your eye area. Some of them hook behind your ears like glasses. Other goggles have a strap (带子) that goes around your head. Both kinds stay right where you put them until you take them off. That way, you can use both hands to work or play sports, and you don't have to worry about something getting in your eyes.
Your eyes are safe, and you can get busy working or playing!
1.Which of the following is a kind of goggles?
A. 
B. 
C. 
D. 
2.From the passage, we know that tears___________.
A. work better than goggles
B. stop things getting into eyes
C. help to wash out the sand or dirt
D. show ones sadness or happiness
3.The underlined word" delicate" in Paragraph 3 means ___________.
A. easily hurt B. quite important C. easily protected D. quite special
4.The fourth paragraph mainly __________.
A. describes different types of goggles
B. tells how goggles develop
C. introduces the problems of goggles
D. encourages people to use goggles
1.D 2.C 3.A 4.D 【解析】本文主要介绍了护目镜的作用，并鼓励人们使用护目镜保护自己的眼睛。 1.细节理解题。题干询问的是：下列哪一个是一种护目镜？根据文章第四段They are made of plastic or glass, and they are tied around your eye area. Some of them hook behin...查看答案和解析>>
湖北省互联网违法和不良信息举报平台 | 网上有害信息举报专区 | 电信诈骗举报专区 | 涉历史虚无主义有害信息举报专区 | 涉企侵权举报专区
违法和不良信息举报电话：027-86699610 举报邮箱：58377363@163.com
