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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.

【小题1】According to the scientists, the enzyme may solve the problem of ________ pollution.
A.airB.waterC.lightD.plastic
【小题2】Researchers discovered that a natural enzyme helped eat plastics ________.
A.in BritainB.in AmericaC.in JapanD.in China
【小题3】Which of the following is TRUE according to the passage?
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.
2022·陕西渭南·一模
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In 1987, a small company named Huawei was started in Shenzhen. After more than 30 years of development, the company has now beaten Apple and become the world’s second-largest maker of smart phones behind Korea’s Samsung. It has also become the world’s largest supplier of 5G.

But recently, Huawei faced some difficulties. The U.S. government ordered a ban (禁令) on its sales in America. American officials said Hunwei gave information that it collected to the Chinese government. At the same time, the U.S. government planned to stop selling parts and services to Huawel, which was believed that Huawei’s business would be hurt.

“We have never received such a request from the Chinese government and we have never tried to get into other systems to collect information. ” Ren Zhengfei, Huawei’s founder and president said. “The ban from the U.S. would have little influence on our company. Huawei has enough ability to deal with the problems. ” Ren added.

In an interview several years ago, Ren Zhengfei said, “I started Huawei with only 4, 000 at the beginning, but now it has become a $100 billion company. The experience was not as romantic as you imagine. ”

Facing the ban of the U.S. , Huawei is growing. Huawei’s smart phone sales around the world rose 50 percent compared to a year earlier in the first three months of 2019. At the same time, sales from both Samsung and Apple fell. So far, Huawei has grown into the world’s largest telecommunications equipment (电信设备) supplier, selling in 170 countries! It may beat Samsung as the largest smart phone maker in the near future.

【小题1】Which company is the largest supplier of 5G in the world?
A.Apple.B.Samsung.C.Nokia.D.Huawei.
【小题2】Why did the U.S. order a ban on Huawei?
A.Huawei’s sales in America were growing faster than Apple.
B.Huawei refused to supply services to the U.S. government.
C.They didn’t want Apple to sell parts and services to Huawei.
D.They thought Huawei collected information for the Chinese government.
【小题3】From what Ren Zhengfei said, we can learn that _________.
A.Huawei is deeply affected by the ban
B.Huawei has go to the system of the U.S.
C.Huawei can solve the problems they are facing
D.Huawei is asked to supply information to China
【小题4】What does the underlined sentence in Paragraph 4 mean?
A.Huawei’s developing experience was hard.
B.It is romantic to start a company with 4, 000.
C.The romantic experience was a large amount of wealth.
D.People can understand Huawei’s developing experience easily.

We can use new way’ to fight the latest virus (病毒). Let’ meet these high—tech helpers in China!

Drones (无人机)
In public, drones are used to tell people to take nucleic acid tests (核酸检测) through the loudspeaker (扬声器) . When people have to stay at home, drones can help deliver (递送) packages to people’s home.

Smart Robots
In some hospitals, smart robots help to send food to patients. The robots can also help to hand out medicine and show the way to people.
During 2022 Winter Olympic Games, smart robots did many things. They served people, reminded people to wear mask and so on.

3D “Hospitals”
A company in Shanghai has produced 15 mobile rooms less than 24 hours by 3D printing technology and sent them to Hubei for patients to live in. Each room is about the size of a bedroom.

AI System
At the Mudanyuan subway station in Beijing, an AI system can check people in crowds to see if they have fevers. About three hundred people can be checked by it in one minute.
【小题1】If you can’t go out, drones can ________ for you.
A.take nucleic acid
B.carry packages
C.do nothing
【小题2】The smart robots can ________ in the hospital according to the passage.
①ask people to wear masks
②serve players
③send food to patients
④give out medicine
⑤give directions
A.①②③
B.③④⑤
C.①②③④⑤
【小题3】It took the company ________ to produce 15 mobile rooms.
A.less than a day
B.less than 24 days
C.more than 24 hours
【小题4】The AI system can check about ________ people every minute.
A.3B.30C.300
【小题5】Where can we probably see the passage?________
A.In a novel.B.In a diary.C.In a magazine.

There will be a kind of new cars in the future. The car is as small as a bike, but it can carry two people in it. People will like this kind of small cars better than the big ones. Everybody can drive the car easily, just like riding a bike. Even children and old people can drive them to schools or parks.

If everyone drives such cars in the future, there will be less pollution in the air. There will be more space for all the cars in cities, and there will also be more space for people to walk in the streets.

The little cars of the future will cost less money to buy and to drive. These little cars can go only 65 kilometers an hour, so driving will be safer. The cars of the future will be fine for going around the city, but they will not be useful for a long trip.

This kind of cars can save a lot of gas(汽油). They will go 450 kilometers, then they have to stop for more gas. They are nice cars. aren’t they?

【小题1】This kind of new cars will be _______ than the cars we use today.
A.more expensiveB.much smallerC.faster
【小题2】If you drive this kind of new cars for four hours, you can probably go ________ at most.
A.260 kilometersB.65 kilometersC.450 kilometers
【小题3】Why do these small cars have to stop after going 450 kilometers?
A.To get more water.B.To get more gas.C.To have a rest.
【小题4】Which of the following is NOT true?
A.Driving big cars can make more air pollution.
B.These small cars can make more space for other cars and people.
C.These small cars will be useful for a long trip
【小题5】We can probably read this passage in ________.
A.an advertisement(广告)B.a food magazineC.a newspaper

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