Scientists are trying to make the deserts into good land again. They want to bring water to the deserts so that people are can live and grow food.They are learning a lot about the deserts. But more and more of the earth is becoming deserts all the time. Scientists may not be able to change the deserts in time.
Why is more and more land becoming deserts? Scientists think that people make deserts. People are doing bad things to the earth.
Some places on the earth don't get very much rain, but they still don't become deserts. This is because some green ants are growing there. Small green plants and grass are very important to dry places. Plants don't let the hot sun make the earth even drier. Plants don't let the wind blow the dirt(泥土)away. When a little bit of(一点儿)rain falls, the plants hold the water. Without plants, the land will become deserts much more easily.
- ( )1. Why do scientists want to bring water to the deserts?
A. Because they are trying to make the deserts into good land again.
B. They want people to live and grow food there.
C. Because they are learning a lot about the deserts.
D Because more and more earth is becoming deserts all the time.
- ( )2. Why is more and more land becoming deserts?
A. There isn't a lot of water over there.
B. There aren't many plants and animals on the land.
C. There are many people doing bad things to the earth.
D Because scientists bring too much water into the deserts.
- ( )3.What does the underlined word＂they＂refer to（指代）？
A. Some places.
D. Bad things.
- ( )4.Some places not getting much rain didn't change into deserts because____.
A. there are some green plants growing there
B. there are a lot of scientists on the land
C. some scientists have brought much water to the land
D. people grow too many plants there
- ( )5. Why is the land easy to become deserts without plants?
A. Because plants are green.
B. Because deserts like plants very much.
C. Because land can't live without plants.
D. Because the plants can hold water, there isn't much dry dirt.
6.个人问题:What human behavior can turn land into desert?How should we mitigate（缓解） the desert problem?至少50个单词。
小组问题:What human behavior can turn land into desert?How should we mitigate（缓解） the desert problem?至少60个单词。
Sandstorms have a great effect on many Asian countries for centuries. Scientists have tries many ways to solve this problem and so have people in China.
In the world. there are four main places where the sandstorms happen. They are Central Asia, North America. Central Africa and Australia.
Northwest China is part of the sandstorm centre in Central Asia. Sandstorms begin in desert areas.
Sandstorms in China appear more often because of climate changes and because people cut down trees and dig up grass. They sometimes affect Beijing. People wake up in the morning to find an orange sky and strong winds with thick, brown-yellow dust covering the whole city.
The storms sometimes last all day and traffic moves very slowly because the thick dust makes it difficult to see.
When a sandstorm arrives in the city, people had better not go out.Huang Xiaomei, who lives in Beijing, says, Cycling in a sandstorm is terrible. The winds are very strong. It's difficult to breathe and the dust makes me ill. So if you want to go out，you'd better wear a mask（口罩）．”
The desert is only 250 kilometres away to the west of Beijing. To prevent it coming nearer, the government is planting trees.
So far, the government has already planted more than 30 billion trees and plans to continue planting for the next five years. People hope it can help.
- ( )7. Where is part of the sandstorm centre in Asia?
A. North America.
B. Central Africa.
C. Northwest China.
D. Northeast China.
- ( )8. Which one isn't the reason why sandstorms happen a lot in China?
A. Climate changes
B. Cutting down trees.
C Digging up grass.
D. Too many deserts.
- ( )9. What's the meaning of the underlined word "dust"?
- ( )10. What should you do when the sandstorm arrives?
A. Stay at home.
B. Ride bikes to work.
C. Make more masks.
D. Plant more trees.
- ( )11. What's the passage mainly about?
A. Sandstorms' effect.
B. What sandstorms are.
C. Sandstorms in Beijing.
D. How to prevent sandstorms.
12.个人问题:How do sandstorms affect our lives?至少50个单词。
小组问题:How do sandstorms affect our lives?至少60个单词。
Have you seen some machines that eat used plastic bottles and give some coins to the users?
Recently, such machines have appeared at universities in Chongqing. They can turn rubbish into treasure and encourage the public to recycle rubbish. The machine is as large as a fridge. Users put an empty bottle in the machine. It is identified (识别 )by a small camera. Then it is put into a built-in bin. The users can get some coins. They can also give away the money.
When the machine is filled with bottles, it will tell the company's head office. Nearby stations will send workers to have bottles collected. They pack and send them to the company.
The bottle recycling machines have greatly encouraged the public to recycle rubbish and saved natural resources. Now the machine only eats plastic bottles. At sometime in the future it will also cover others, such as glass bottles to turn more rubbish into treasure and make full use of the natural resources.
People can also see similar machines in Shanghai. In the future, more and more such machines will appear at some large stations. Bus stops, neighborhoods and schools may have a long way to go.
- ( )13. What can you get if you put some used plastic bottles into the machines which have appeared at universities in Chongqing?
A. Some cameras.
B. Some rubbish.
C. Some coins
D. Some bottles.
- ( )14. What s the meaning of the underlined word "treasure"?
- ( )15. Who collected the bottles in the machines?
A. The users of the machines.
B. The students nearby.
C. The company's officers.
D. The company's workers.
- ( )16. Why do people build more recycling machines?
A. To make more money.
B. To save natural resources
C. To make plastic bottles.
D. To save more Too.
- ( )17. Where can you see the recycling machines now?
A. Only in Chongqing.
B. Only in Shanghai.
C. In Chongqing and Shanghai.
D. In Chongqing and Beijing.
18.个人问题:How do they turn waste into treasure? How does this affect our lives?至少50个单词。
小组问题:How do they turn waste into treasure? How does this affect our lives?至少60个单词。
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