Many people know that rubbish is a big problem on planet Earth. What many people don't know is that junk has become a problem in outer space too.
According to BBC News, there are more than 22, 000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes (望远镜). There are also millions of smaller pieces of junk that we can't see.
Objects, like bits of old space rockets or satellites, move around the planet at very high speeds, so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage the vehicle (交通工具).
To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U. S. satellite hit an old Russian rocket in 2009, it broke into more than 2,000 pieces, increasing the amount of space junk.
To reduce additional space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth's atmosphere after that time. In the upper parts of the atmosphere, it will burn up.
Many scientists are also suggesting different ways to clean up space junk. In England scientists are testing a metal net that can be fired into space junk. The net catches the junk and then pulls it into the earth's atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely destroyed.
"The problem is becoming more challenging because we're sending more objects into space to help people use their mobile phones and computers," says Marco Castronuovo, an Italian space researcher.
"The time to act is now. The longer we leave the problem, the bigger it will become," he says.
1. Junk has become a problem in2. What would happen if the tiniest piece of junk crashed into a spaceship?
3. Why have countries agreed that all new space tools can only stay in space for 25 years at most?
4. 找出并写下第六段的主题句
5. 将文中画线句子译成汉语。
相似题推荐
In 2020, China’s Chang’e 5 mission collected 1,731 grams of moon soil (土壤) and brought it to Earth. (A)China became the third country to collect moon soil after Russia and the United States. Up to now, a total of 44,857.7 milligrams of the soil have been given to 62 research teams in China. By studying the soil, scientists learn more about the moon’s geology (地质), weather and other things, according to the Chinese Academy of Sciences (CAS). What new findings have scientists made? Let’s have a look.
Air on the moon
In May, scientists from Nanjing University found that the soil on the moon might be useful for turning carbon dioxide (CO2) into oxygen (氧气) and fuel (燃料). The soil has some special chemicals in it. (B)These can work as catalysts (催化剂) to make oxygen with sunlight and CO2. If this really works, astronauts can turn the CO2 they breathe into oxygen. Then they can live on the moon for a longer time. The team hopes for a chance to test this system on the moon someday.
Powerful energy
(C)Helium (氦)-3 is a valuable fuel that can provide safer nuclear energy (核能). It is not radioactive (放射性的) and would not produce dangerous waste. It’s rare (稀有的) on Earth, but after studying samples of moon soil, scientists found that the moon is rich in Helium-3! According to Ouyang Ziyuan, a senior adviser to China’s lunar program and its former chief scientist, there is enough Helium-3 on the moon for all people on Earth to have clean energy for 10,000 years!
1. 把（A）处划线句子翻译成汉语：2. 把（C）处划线句子翻译成汉语：
3. 请在文章中列举出科学家们的两种新发现：
4. 请写出文中（B）处划线部分指代的内容：
5. 请简要概括文章大意：
Humans have always been interested in the moon. About 2, 000 years ago, scientists had already known that the moon moves around the earth and where it would be in the sky at different times of the year. In old times, everything about the moon was learned by watching it carefully at night.
When scientists could use telescopes (望远镜) to study the moon more closely, they found the moon was made of rocks. Most scientists thought moon rocks would be different from those on earth. This was because they believed the moon had once been a planet that was caught in the earth’s gravity millions of years ago.
In 1969, moon rocks were finally brought to the earth and studied. Much to their surprise, scientists found that, except for water, the moon and the earth were made of the same things. Once again, new ideas were needed for this new study.
After years of study, most scientists now think that the moon was once part of the earth. They believe very early in its history, maybe 4 million years ago, something that was about the size of Mars hit the earth. This sent billions of rocks into space around our planet. These rocks slowly joined together and after many years became the moon.
Humans’ steps of exploring the moon will never stop. In the future, even though our ideas about the moon may change again, we’ll still show an interest in it.
1. At first, most scientists thought moon rocks were2.
3. Now most scientists think the moon once belonged to
4. People will never stop
5. How did people learn about the moon in ancient times?
Mars is full of surprises. Not long ago, something strange showed up in a picture of this planet. It is a pattern (图案) on the ground that looks like a bear face.
The picture was taken from high above Mars. Scientists took a closer look at the bear. Different marks on the ground make up the face of the bear. Its two eyes are big holes known as craters (坑). Rocks from space hit the surface of Mars long ago and then made the craters. The nose of the bear is a hill. Part of the hill has broken off in the shape of a V. The circle that forms the head is a crack (裂缝) in the ground. It might be the edge (边缘) of a crater that was much larger. Later, something like lava (岩浆) filled it. The “lava” might have come out of the hill that formed the nose.
Seeing a bear face on Mars is not as unusual as it might sound. The human mind is finding patterns in the world all the time. This is why you might see a cloud and think that its shape is like an animal or object.
People watching the surface of Mars have had experiences like this. In 1976, people were excited to find something like a human face in a picture of Mars. But it was just a huge rock.
These days, people take pictures of all kinds of things on Mars. Some have strange shapes. They might look like Martians made them, but it is probably not true. So far, Mars seems to be lifeless. The strange shapes people see are just patterns in the land.
Recently, a pattern was found on Mars. It looks like a face of a bear. Scientists took a closer look at it. In fact, the bear face is made up of different marks on the ground. The eyes are two large It might not be as unusual as it sounds to see such a face on Mars. The human mind is Now, people take pictures of all kinds of things on Mars. Some in |
You have probably never heard of Amy Hayes, but she is a most unusual woman. She lives in a house she built herself out of rubbish. The windows and doors come from old buildings around her town that were pulled down. The top of the house is an old boat turned up and down. And the gate in front of her house is made of rocks and old glass bottles.
Jassica wong from Hong Kong uses old clothes that people don’t wear any more to make bags. She opened a small shop where she sells her bags, and she also set up a website to sell them online. She especially likes to use old jeans to make handbags. Her bags are cute and useful. “I plan to write a book about new ways to use old clothes,” she said. “I hope people can read my book and enjoy it!”
Wang Tao set up a small business in Shanghai four years ago. He is known for using iron and other materials from old cars to make beautiful art pieces. Some are large pieces that look like animals or humans, and some are smaller pieces you can put at home. The more popular works can even be seen in art shops around the city. Wang Tao hopes to set up a “metal art” theme park to show people the importance of environmental protection. Not only can the art bring happiness to others, but it also shows that even cold, hard iron can be brought back to life with a little creativity.
| The title: Rethink, | ||
| Names | What | What did they make? |
| Amy Hayes | Rubbish and old things | a house |
| Old clothes | bags | |
| Wang Tao | Iron and other materials from old cars | |
Many kids want to help keep the environment clean but don’t know how to start. In fact, even the simplest everyday activities can make a real difference to the environment. Here is how to do it.
Don’t litter. Litter can pollute our water and do harm to us and to wild animals.
Recycle bottles, paper and plastic. This is a good habit to develop and can really make a difference.
Always turn off lights and electronic devices (设备) when they are not being used.
Ride your bike or walk to nearby places rather than riding in a car. Encourage your friends and family to do the same.
Don’t throw your old clothes or toys away. 2 Give them to a local charity (慈善组织) or someone that may need them.
Avoid using plastic bags by bringing your own reusable bags to store.
If you see waste, pick it up.
By following these tips and using them in your everyday life, you will make the world a greener place. It’s never too late to start, and right now is OK!
1. What should you do when classes online are over at night?2. Translate the underlined sentence into Chinese.
3. When your parents go shopping, you should encourage them _________.（答案不止一个）
| A．to ride a bike | B．to walk | C．to take reusable bags with them |
| A．No litter. |
| B．Change bottles, paper and plastic into something else to be reused. |
| C．Give old clothes or toys to people who need them. |
| D．Pick up waste when you see it. |
【推荐3】Have you ever heard of e-waste? How do you deal with your computers, MP4 players and mobile phones when they’re broken or you want a new one?
Most people just throw them away. With the development of electric industry, e-waste pollution has become a serious problem. According to the United Nations, in 2014, people around the world produced 41.8 million tons of e-waste and only recycled 6.5 million tons. The US was the biggest waster, producing 7.1 million tons. China came second, with 6 million tons.
It’s important to pay attention to e-waste. It can either be valuable for harmful, depending on how we deal with it. E-waste is a valuable urban mine(城市矿山). The value of the metals, like gold and silver in the waste around the world, is amazing. And we can reuse the metals. But if people throw them away, the toxic chemicals can be too bad for people’s health.
Apple, for example, now recycles people’s used products in China when they are buying new ones. The company will test and repair the used ones and sell them at lower prices.
In a word, we should deal with e-waste properly to reduce pollution.
1题完成句子；2—3题回答问题；4题找出并写下全文的主题句；5题将文章画线句子译成汉语。
1. When our old mobile phones are broken, most of us
2. What is useful in the e-waste?
3. What does Apple do in China when they buy new products?
4.
5.
Do you enjoy eating navel oranges (脐橙)? If your answer is “Yes”, why don’t you try some from Zigui, a county in the west of Hubei Province? The navel oranges there taste really nice. They are popular with people all over the country.
Zigui County is famous as “the hometown (家乡) of Chinese navel oranges”. The farmers there started to plant orange trees more than 2,000 years ago. Now there are orange trees everywhere in the county.
Planting orange trees needs much hard work. Years ago, the farmers in Zigui had to spend lots of time on their orange trees. They needed to do everything by themselves. The harvest season (丰收季) was the busiest time of the year for them. After they harvested their navel oranges, they had to carry them to the market to sell for money.
However, since the smart agriculture program (智慧农业项目) was carried out (实行) in Zigui in October 2019, everything has changed. Now the farmers there are living a much easier and more comfortable life. They can look after their farmland through smartphone apps. The meteorological (气象) stations help them know about the weather and deal with (应付) different weather situations. After they harvest their navel oranges, they usually sell them on the Internet. In this way, their navel oranges can reach people all over the country.
1. The passage mainly talks about2. The farmers in Zigui County started to plant orange trees
3. Where did the farmers sell their navel oranges years ago?
4. According to Paragraph 4, the meteorological stations help the farmers
5. What do you think of the smart agriculture program?
Do potatoes play a small role (角色) on your dinner table? Maybe it’s time to make a big change! Potatoes have become China’s fourth staple food (主食) after rice, wheat and corn. Using potatoes as a staple can make us healthier. They do good to us in many ways.
Potatoes are nutritious (有营养的). They are rich in vitamin C. As we all know, vitamin C can help people keep strong. A potato’s vitamin C is as rich as 10 apples. Potatoes are also low in calories — they don’t have as much calories as wheat and corn have, but they have high-quality protein. These are what people are looking for in a healthy diet (饮食).
Also, potatoes are easy to grow. People can plant them in almost every part of China. They can even grow well on barren land. What’s more, potatoes don’t need much water to grow. China is facing water shortage problems, so potatoes are a good choice.
Many Chinese people think potatoes are vegetables. They cook potatoes along with other things, and the dishes made with potatoes are really delicious. As a staple, potatoes can also be cooked differently. Scientists have tried to make noodles and other staple foods with potatoes, just like how we use rice or wheat. Would you like to try potato noodles? They taste pretty good.
Potatoes have many good points, but it doesn’t mean we can eat them every day. Potatoes have a lot of starch (淀粉). If we eat them a lot and do little exercise, we will get fat. Also, too much fried potato food, such as French fries or potato chips, will be bad for our health.
In a word, we are what we eat. No matter how good the food is, we should eat in a right way, then we’ll look good and healthy.
1. What nutrition are potatoes rich in?2. Where can people plant potatoes in China?
3. What have scientists tried to make with potatoes?
4. Would you like to eat more potatoes in the future? Why or why not? (Please give two reasons.)
【推荐3】No one wants to overspend on their supermarket shopping but to save money every week. Preparations start before you even go into the store. Here is how to make sure you are always getting your shopping for the best price.
● Greate your list.
Write a full list which includes two parts, something necessary for a living and something for fun. With a strict list, you won’t easily change your mind to buy more than you need.
● Check the cupboards.
One of the easiest ways to overspend is buying what you don’t need. Before leaving, take time to check what products you have in the house, especially in the cupboards. Buy what you badly need and it will help you save money before you step into the supermarkets.
● Know your budget（预算）.
Keep in mind how much you plan to spend. It is possible to get your shopping for less, but you need to pay attention to the products and brands you buy to support savings.
● Compare prices.
You should make a comparison between the prices offered by different supermarkets. So if you try to buy your shopping for less, compare the prices in different shops, which makes sure that you are always visiting the cheapest supermarket for your shopping.
● Choose the best time for shopping.
If you know your supermarket well, there will certainly be a preferred time to shop. This could be at the quietest time to make sure you get peace while working out the total cost of your shopping. And a few hours before closing helps you to get a special offer. That will bring down the cost of your shopping.
Follow them and you are sure to make huge savings on your weekly shopping.
| How to help you save on your weekly shopping | |
| passage outline | Supporting details |
| Introduction | Almost everyone wants to buy most with the |
| Tips | ● You should make a shopping list ● You must spent time ● You should always remember how much you plan to spend on the products and it’s necessary for you to pay attention to the products and brands. ● Different supermarkets ● You’d better |
| Conclusion | Follow them and it will help you bring down the cost of weekly shopping. |
