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 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
). “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.Which is not true about the advantage of enzyme?
A.It’s able to make plastics become smaller parts.
B.It can solve the problem of the plastic pollution right now.
C.It’s used to make the plastics disappear in a rapid way.
2.The underlined phrase “break down” in the passage probably means “________” in Chinese.
A.实验 B.生产 C.分解
3.Which isn't the change they made to the natural enzyme?
A.Some amino acids were put in it.
B.The speed of plastic-eating has been improved.
C.The quality of plastic -eating remained the same.
4.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 woks better than the improved one.
5.We can’t infer from the study that________.
A.The team is able to increase the speed of the plastic -eating abilities
B.Efforts are made to increase the number of PET that the enzyme breaks down
C.Few efforts are required to the improvement of this new enzyme
Parents now complain about teenagers' noses always in their phones. But they might want to check out their own screen time habits.
A study was put out recently. It was from the Pew Research Center. The study surveyed 743 U.S. teens and 1,058US parents of teens from March7to April10. It found that (two thirds of the parents worry about the amount of time their teenage children spend in front of screens. But more than a third of the parents also worry about their own screen time.
Over a half of the teens said that parents are often or sometimes distracted(精神不集中的) .
But have a conversation with them. The study also notes that nearly three fourths of the teens check messages as soon as they wake up. Parents do the same, but at a low rate----57%. However, that is still a lot.
Many teens are trying to do something about it. 52 percent have cut back on the time they spend on their phone. 57 percent have done the same with social media.
Experts say parents have a big role in their kids' screen habits. Setting a good example is a big part of it.
"Kids don't always do what we say but they do as we do," said Donald Shifrin. He is a professor at the university of Washington School of Medicine. Parents are at the door that kids will walk through on their way to the world.
1.What do we know from the survey?
A.All parents are worried about their own screen time.
B.Some parents don't pay attention to what the kids are going to say.
C.almost 75% of parents check the messages when they wake up.
2.According to the survey, how many parents are worried about their own screen time?
A.about704 B.about 352 C.about 247
3.What's Paragraph 4 mainly about?
A.The efforts that teens have made to reduce the screen time habits.
B.Teens' plan to cut back the screen time habits.
C.Teens' resolution to spend less time on the screen
4.According to the expert, parents can change their kids' screen time habits by ________.
A.talking with their kids. B.cutting back kids' screen time. C.changing their own habits.
5.What's the main idea of the passage?
A.It's bad to use phones very often.
B.Teens and adults' screen time.
C.Experts show their worries about teens' screen time habits.
Every year on 15th October, over 200 million people around the world take part in Global Handwashing Day. But why do we have a day for something we do all the time? Well, research shows that not enough people often wash their hands with soap. Experts believe that this leads to the deaths of millions of people every year.
Sidibe, a public health expert says soap is the most beautiful invention in public health'. Washing your hands with soap can have a huge impact on reducing (减少) the spread of diseases. Handwashing with soap prevents babies from getting ill and keeps children healthy and in school.
However, washing hands with soap does not happen as often as you might think. This is partly because there aren't enough resources (资源) in poorer countries, but it's also because for many people, handwashing is simply not part of their everyday life. It's not easy to get people to change habits they learned in early childhood -- but this is what Global Handwashing Day wants to do.
In 2008, the Indian cricket team joined around 100 million Indian schoolchildren in washing their hands to promote (促进) the first ever Global Handwashing Day. Every year since then, many different events have been held around the world. In 2014. Global Handwashing Day was used in the fight against Ebola, a very serious disease, with events held in affected (受感染的) African countries.
Today, local and national leaders continue to use the day to spread the message about the importance of clean hands. The hope is that handwashing becomes a necessary part of people's lives and improves the health of millions around the world.
1.Who started Global Handwashing Day?
A.Public health experts. B.The Indians. C.African schoolchildren.
2.What does the underlined word "impact" mean?
A.Danger. B.Influence. C.Background.
3.What's the main idea of the last paragraph?
A.Washing hands with soap is good for public health.
B.Washing hands with soap doesn't become part of people's lives.
C.People all over the world are encouraged to wash hands with soap.
4.Which statement is NOT TRUE according to the passage?
A.A few people's unwillingness to wash hands with soap everyday lead to many people's death.
B.People in different countries join in Global Handwashing Day.
C.Global Handwashing Day's purpose is only wanting people to wash hands without soap.
5.What would be the best title for the passage?
A.Learning to Use Soap. B.Changing Your Habits C.Living a Healthy Life.
Country Life Market
Our fruit and vegetables come in fresh every morning.
Special prices for the first month
Opening hours: 7: 00 a.m.10: 00 p.m.
Address: No 8 Guangming Street
Telephone: 010-62617788
Looking for a roommate
I'm Alice. I have a house with 2 bedrooms. There are many things in it, like a TV, a washing machine and a fridge. You only need to pay US $200 for one-bedroom each month. And it includes the cost of the Internet, so you can bring your computer. There are two rules for you to follow: You mustn't make lots of noise in the house and you can't keep a pet.
Telephone: 239-5478603
E-mail: room.tor.ent@tom.com
1.If you live with Alice, what are the things you can't do?
A.watching the TV provided B.using the WiFi C.using Alice's computer
2.Which of the following is NOT true?
A.The price for the first month in Country Life Market is low.
B.Here are two ways to contact Alice if you want to share the apartment with her.
C.You are allowed to keep a pet to be Alice's roommate.
3.Where can we probably find the information?
A.In a local newspaper B.In a novel. C.In a science magazine.
Robert Show | |
Price: adults ($30), people aged 60 and above ($20) children aged 1 to 17 ($15) Time: from 10 a.m. to 5 p.m. every day Tel: 400567333 Free parking Free WiFi Welcome to see |
|
1.How long is the show held every day?
A.For 5 hours. B.For 6 hours. C.For 7 hours.
2.We can learn from the chart that ________.
A.18-year-old John needs to spend $20
B.visitors don't need to pay for the parking fee.
C.visitors can email to get more information.
We are taught from childhood to be polite, civilized (有教养的) and kind, yet many of us ___________this as we grow up.
That’s not the case for Yang Yang, a 14-year-old from Changsha, Hunan province. She has moved many people by being ___________.
It was a day in April when Yang was getting ready to eat in a local restaurant. But then she ___________ dropped a plate full of food. She stood still and was at a loss. The ___________ manager (店长) was nice. She comforted (安慰) Yang, saying “It doesn’t matter. We can give you ___________ meal for free.”
Everyone thought that this small episode (插曲) would end like that. But, when Yang left after eating, the waiter found 75 yuan in cash and a ___________on the table. It said, “I’m sorry that the money might not be enough to ___________ for your loss, but that’s all I have. Thank you for your kindness.” The manager was deeply touched after reading the note. The money was probably a ___________ worth of pocket money for the girl.
The manager posted about this on social media and called for a search for this young girl. Many newspapers, including People’s Daily, re-posted it and joined the search. Finally, Yang was found ____________ her teacher heard about the story.
People’s Daily commented (评论) on the story, saying that it showed the good in people. The manager was considerate and cared about Yang’s situation___________ Yang was grateful and responsible.
1.A.remember B.forget C.follow
2.A.honest B.hopeful C.humorous
3.A.gradually B.quickly C.accidentally
4.A.hotel B.restaurant C.office
5.A.other B.another C.others
6.A.note B.message C.letter
7.A.take up B.put up C.make up
8.A.week’s B.month’s C.year’s
9.A.before B.as C.after
10.A.although B.if C.while
