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 while examining the structure(结构) 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 natural 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 problem of ________ pollution.| A．air | B．water | C．light | D．plastic |
| A．in Britain | B．in America | C．in Japan | D．in China |
| A．The scientists are still trying to improve the enzyme. |
| B．The enzyme will pollute large areas of land and water. |
| C．The natural enzyme works better than the improved one. |
| D．The natural enzyme is harmful to humans and animals. |
相似题推荐
【推荐1】
Gaode Map is one of the most helpful mobile phone maps. It provides the location（位置）and life services. It can tell you the place you want to go to.
It’s such an interesting app(应用程序) and is popular with the young. The app is suitable (合适的) for friends who are going to take exams, or for the users to remember more words. It’s easily used by offering users pictures, sounds as well as short videos in English.
How many steps did you take today? This app does not just mark down the number of steps you take. Your real steps can take you on a virtual (虚拟的) journey around the world. It can really give you the power to move ahead.
| A．Gaode Map. | B．The camera app. | C．The 100 app. | D．The walking app. |
| A．Finding the way to a place. | B．Remembering words. |
| C．Taking pictures. | D．Marking down the steps. |
| A．The 100 app is popular with the young. |
| B．The walking app can encourage you to move ahead. |
| C．Gaode Map is the most professional mobile phone map. |
| D．The 100 app provides the users with pictures, sounds and short videos. |
A man-made a nice talking machine(机器). It could weigh people’s weight(量体重). The man wanted to test the machine before he could make a lot of them for sale.
The first one using the machine is a Japanese woman. She stands on the machine. “Good morning, Madam,” it said in Japanese, “Your weight is 72 kilograms. That’s three kilograms more. If you eat more fruit and vegetables, you’ll soon be all right. Please have a nice day.”
The second one to use the machine is a Chinese girl. She stands on the machine. “Good morning, Miss,” the machine said in Chinese, “Your weight is 45 kilograms. It’s all right for your age and height(身高). Keep eating what you eat every day. Please have a nice day.”
The third one to use the machine is an American woman. She thinks for a long time to stand on the machine. The machine speaks quickly in English, “One of you get off?”
阅读下列短文，做出正误判断或选出最佳选项。判断正(A) 误(B)题,1. The machine can weigh people’s weight and speak to them in different languages (语言)
2. The machine tells the Japanese woman she is thin and she should eat more meat.
3. From the passage, we know the American woman is very healthy, not fat or thin.
4. In the passage, the machine speaks three languages.
5. The underlined word “test” in the first paragraph means (意思是) making a new thing.
【推荐3】Do you know what a service robot (服务型机器人) is? When you come into the house, he turns on (打开) the lights. While you have dinner, he cleans the room. Before you go to bed, he tells you what the weather (天气) will be like tomorrow, and then reads you a bedtime story. We also call it the “service robot”. Service robots make people’s lives easier and more beautiful.
From cleaning to teaching, music to sports, they can do many kinds of jobs. Teotronico is a service robot as well as a music teacher. He can play the piano well. There is also a service robot called Bestic. It can act (行动) as a man and feed (喂养) people. It can be a good helper for little kids, old people and those having difficulties using their hands. The supermarket robot Alpha makes buying things easier. You can talk with the robot. It will help you find things quickly and then take them for you to make you more relaxed.
It may not be far when every family has one service robot. Do you want to have a service robot, too?
1. What may the service robot do when people have dinner according to the first paragraph?| A．Do some cleaning. | B．Turn on the TV. |
| C．Do some shopping. | D．Read them stories. |
| A．By telling us a story. |
| B．By giving us some examples (例子). |
| C．By showing us the results (结果) of studies. |
| D．By answering some questions. |
| A．Jenny — She can’t eat food by herself. |
| B．Nancy — Her hands are injured (受伤的). |
| C．Bob — He doesn’t know how to do his homework. |
| D．Daniel — He is going to be 85 years old. |
| A．Interesting bedtime stories. |
| B．Robots working in schools. |
| C．Life in the future (将来). |
| D．Useful service robots. |
1. Where will people meet? ________
| A．At the beach | B．At the square | C．At the university |
| A．See the sea animals. | B．Play with sea birds. | C．Pick up the rubbish. |
| A．People who want to join the group will meet on August 8. |
| B．The beach cleanup is to protect wildlife and the sea. |
| C．People will get paid if they join the group. |
【推荐2】My name is Molly. People should care about the environment. Let me tell you what my family and friends usually do in our daily life to protect the environment.
My grandparents often go shopping with a basket instead of plastic bags. My father usually takes the bus to work instead of driving the car. My mother knows saving water is very important, so she always saves used water to water flowers. My sister and I often work as volunteers. We go to the park and pick up litter there. My brother is only five years old and he likes drawing. We often tell him to use both sides of the paper to draw. In school my friends and I turn off the lights as soon as we leave the classroom. Our environment will be better and better through our efforts.
根据语篇内容，判断下列句子正误，正确的在答题卡上将 “T”涂黑，错误的在答题卡上将 “F”涂黑。1. Grandparents often go shopping with plastic bags.
2. Father usually walks to work.
3. Mother always saves used water to water flowers.
4. Molly often picks up litter with her friends at school.
5. The environment will be better and better if we try our best to do things for it.
【推荐3】The earth is our home and we should protect it. So, let’s join hands to make it greener! Green inventions become popular at present. More and more people use used things in their works.
Special furniture
When we’re talking about furniture, we always think of furniture made of wood and plastic. However, Vadim Kibardin created a set of special furniture. It was made of waste paper.
The woven (编织) bag
It’s made of bamboo, which is strong and not easy to break. Sho Shibuya believes that using woven bags can decrease the use of plastic shopping bags.
Woven sports shoes
Emilie Burfeind has created a pair of woven sports shoes. One part of the shoes is made of dog hair collected from dog owners. In Germany, up to 80 tons of dog hair is thrown away every year. The cost of such woven sports shoes is low.
The special iron (熨斗)
Saksham Mahajan thinks that bamboo should be widely used, so the bamboo iron was born. The bamboo iron is different from the traditional iron in both the look and use. It can save energy while smoothing down the clothes.
1. What was the special furniture made of?| A．Paper. | B．Plastic. | C．Bamboo. | D．Wood. |
| A．Their cost is low. | B．They are very light. |
| C．They are easy to wash. | D．They are comfortable to wear. |
| A．A Green Life | B．Traditional Arts | C．Green Inventions | D．Famous Inventions |
 | A. Walkup Do you walk every day? How many steps do you take every day? This app keeps the steps you take. |
 | B. Evernote This app helps you to write something with words, pictures and even videos. You never have to worry about losing the things you write. |
 | C. City maps 2 go Are you afraid to get lost in a new city? This app gives you the maps of different cities around the world and something about great places, restaurants, hotels and so on. |
 | D. LEB Do you want to speak good English? This app helps you learn English for free from the UK. You can practice English listening, speaking and so on. Let's start now. |
 | E. Takeaway Order food online with your telephone with this app. You can easier order delicious food from restaurants. You just stay at home and get your food. |
【推荐2】Where does the wind come from? What makes the wind move all the time? Scientists (科学家) tell us that it is the sun that makes it move, and makes it blow. When the sun shines on the earth, it makes the earth hot. Then the earth makes the air hot. When the air becomes hotter, and it also becomes lighter. The light air goes up. Cool air comes in to take the place of (代替) the hot air. The hot, light air goes up higher and higher and later it becomes cool. Then it comes down again, and then the earth makes it hot again, and it has to go up. When the air moves, we have wind.
根据短文内容，选择最佳答案。
1. What makes the wind move?
| A．The air. | B．The sun. | C．The earth. |
| A．the sun | B．the wind | C．the air |
a. The earth makes the air hot. b. The hot air goes up.
c. The sun shines on the earth. d. The hot air becomes cool.
| A．a-b-c-d | B．b-a-c-d | C．c-a-b-d |
| A．wind | B．the sun | C．the earth |
【推荐3】Welcome to Our School Clubs
 Chinese Calligraphy(书法) Club Do you want to learn how to write traditional Chinese characters? Do you want to enjoy the beauty of Chinese Calligraphy? Ms Zhao is waiting for you. Time: Every Thursday afternoon Room: 105 |  Beijing Opera Club Are you interested in music, dancing, painting or beautiful clothes? You can enjoy all of these in our club. Sometimes we go to Mei Lanfang Theatre to watch Beijing Opera. Time: Friday afternoon Room:107 | |
 Taijiquan Club Choose something new and fun. Taiji is an interesting and traditional kind of exercise. It’s slow and quiet, but very good for your health. Time: 5:30 pm—6:30 pm (from Monday to Friday) Room: 201 |  Chinese Knot Club Do you like art? Come to our Chinese Knot(结) Club. Make your own knots and learn something about Chinese culture. The traditional red knots bring you good luck. Time: Tuesday afternoon Room:308 |
| A．Room 105 | B．Room 201 | C．Room 107 | D．Room 308 |
| A．At 5:00 pm on Sunday. | B．At 5:30 pm on Saturday. |
| C．At 5:00 pm on Tuesday. | D．At 6:00 pm on Wednesday. |
| A．good characters | B．good luck | C．beautiful clothes | D．healthy life |
| A．Your teacher. | B．Your parents. | C．Your friend. | D．Ms. Zhao. |
| A．Fast. | B．Slow. | C．Noisy. | D．Soft. |
