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.
Gardening is popular in many parts of the world. It brings us sweet smelling flowers, fresh fruit and vegetables. But you can get more from your garden.
Gardening helps to keep healthy. Today’s people sit indoors for too long and don’t get much exercise . When you garden,you have to move around . It’s a good chance for you to exercise your body by watering flowers or doing some digging.Besides, when you are in your garden, you can feel the warm sunshine. This means you are getting Vitamin D．It help your bodies use calcium (钙),which necessary to keep your bones(骨骼) strong.
It gets them off computers, televisions and phones. Gardening can be great teacher to teach children about nature and healthy eating. It can also help them to understand the meaning of “No pains, no gains.”
Gardening is a great way to meet people and build relationships. When you are gardening, you are outdoors. So it is a perfect time to communicate with your neighbors. Most people love to talk about their hobbies, and so do gardeners. They usually enjoy showing people what they are growing. And most enjoy sharing advice and stories about their gardens.
1.When it’s , you can get Vitamin D in your garden.
A. sunny B. cloudy C. snowy D. rainy
2.According to the passage, is one of the gardening activities.
A. watching TV B. watering flowers
C. walking dogs D. playing with phones
3.Which of the following can be the missing part in Paragraph 3?
A. Gardening will be good for your bones.
B. Gardening may help people to feel happy.
C. Gardening is a great activity to do with children.
D. Gardening can be a good way to meet neighbors.
4.The best title of the passage may be “ ” .
A. Outdoor Activities B. Advantages of Gardening
C. Healthy Eating Habits D. Relationships with Neighbors
When I was four, one day I was playing outside our house. I saw my grandfaher’s truck. I’t was black and looked very old. I thought, “Crandpa doesn’t have to drive such an ugly truck. Maybe I can make it look better.”I got some paint and a brush which were left in the kitchen by my father. I painted the truck white and blue all over. I was finishing the job when my mum walked up and stopped me. She was worried that my grandfather would be angry. However, when my grandfather looked at my paintings on the truck, he laughed loudly, “Angela, that’s the prettiest truck I’ve ever seen! I love it! ”
Sometimes adults(成年人) don’t stop to see things through children’s eyes. They missed so much beauty in the world. Luckily, my grandfather saw things in another way.
1.At the age of ,Angela painted her grandfather’s truck white and blue.
A. four B. five C. six D. seven
2.Angela found some paint and a brush .
A. in the truck B. outside the house C. in the kitchen D. outside the park
3.Angela’s grandfather when he saw her paintings.
A. was worried B. shouted angrily C. became sad D. laughed loudly
Everyone has dreams. Lily dreamed of being a dancer. She took _______ lessons and all her teachers thought she was an excellent student.
One day she saw a notice. It said that a famous dancing group would be performing in her town._______thought, “I must show the leader my dancing skills.”She waited for the group leader in the dressing room. _______the leader appeared, she came up and handed him the flowers she prepared. The thorns(刺) hurt her fingers and blood came out. But she was too_______ to care about he pain. She expressed her strong wish to be a dancer and begged(乞求) to show her dance.
“All right. You dance, ” the leader agreed. But half way through the dance, he stopped her, “ I’m sorry, in my mind you’re not good enough! ” On hearing this, Lily_______ out as fast as her legs could carry her. It was so hard for her to accept this. She lost heart and_______ her dream.
Several years later, the dancing group came to her town again. She decided to find out_______ the leader had told her she was not good enough.
This was his reply, “I tell this_______every student.”
“You’ve ruined(毁掉)my life!” she shouted angrily.
The leader went on, “I remember your present of _______ and how the thorns had hurt your fingers but you carried on bravely. It was a pity that you didn’t take dancing like that and stopped trying so________ . So you are still not good enough for dancing!”
1.A. singing B. reading C. dancing D. dressing
2.A. He B. She C. They D. We
3.A. When B. Since C. Before D. Unless
4.A. weak B. bored C. excited D. tired
5.A. worked B. ran C. found D. looked
6.A. got on B. went on C. picked up D. gave up
7.A. why B. how C. who D. what
8.A. on B. at C. in D. to
9.A. books B. dances C. flowers D. dresses
10.A. happily B. easily C. luckily D. safely
—Excuse me! Do you know ?
—It’s two kilometers away from here.
A. where is the supermarket B. when does the supermarket open
C. where the supermarket is D. when the supermarket opens
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
