A group of scientists from Sweden have unlock...

A group of scientists from Sweden have unlocked one of nature's biggest secrets. The scientists have worked out how spiders make such strong silk when they build their webs. The silk that spiders make is strong and even tougher than steel. Being able to produce man-made spider silk has long been a dream of many scientists. Now, researchers from the Swedish University of Agricultural Sciences have, step by step, developed a method that works. They've found that the materials for webs arc in a spider's silk gland (丝腺) as protein. The gland has a level of acidity (酸度) that helps make the protein into very strong silk. The researchers reported that they could produce man-made spider silk by copying the process.

The new man-made silk could be very useful to humans. Doctors are interested in it. They think it can help people get well after a bum. Some doctors believe the new silk could be used to take the place of the torn ligaments (撕裂的韧带) in the body. Plane makers and makers of protective clothing also see many uses for the new silk.

Senior researcher Anna Rising spoke about how 　　 ▲　　 the new discovery could be. She said, "This is the first successful example of copying spider silk-making process. In the future, this may allow industrial production of man-made silk, which can be used in many fields and make our life much better. The silk could become a valuable material for us."

1.The man-made silk can be used (o do many things EXCEPT 　　　　 .

A.help patients get well B.build excellent planes

C.stop ligaments being torn D.make protective clothing

2.Which of the following can be put in 　　 ▲　　 ?

A.simple B.important C.awful D.boring

3.According to Anna Rising, the new material 　　　　 .

A.will improve our life a lot B.can help fight air pollution

C.will take the place of many other materials D.can help us make more scientific discoveries

4.What's the best title for the passage?

A.Spider silk is good for humans B.Scientists from Sweden are great

C.Making spider silk is now possible D.Making scientific discoveries is hard

九年级英语阅读单选中等难度题查看答案及解析

The human brain's power could compete with any machine. And now a group of scientists from across Europe are trying to build one using the world's most p1. computer.

Our brains have 100 billion neurons Each one performs billions of ‘calculations’ second　 s2. to a desktop computer.

So the brain computer will need to be able to do a billion calculations.

Finding a way to power the supercomputer will be one of the Scientists' major challenges. They hope to c3. it within 12 years.

Group leader, Professor Henry Markram, said, “The billions of interconnected neurons make it hard for us to truly understand how the brain works. Simulating it will make it much e4. allowing us to operate and measure any aspect of the brain.”

The brain will be built in facility in Germany. It will have thousands of 3D images, so scientists can “fly” around different areas and w5. how they communicate with each other.

If the “brain” works, it will help scientists understand brain diseases such as Parkinson's, and know more about how we think and make d6..

There are concerns about the consequences of the computers which can think for themselves. But Professor Markram said “This is one of the t7. great challengers for humans. We need to understand earth, space and the brain. We need to understand what makes us human.”

九年级英语单词填空简单题查看答案及解析

Cao Yuan,a 22-year-old Chinese scientist, was regarded______one of the 10 top people by Nature in 2019.

A.as B.for C.in D.at

九年级英语单选题中等难度题查看答案及解析

Scientists have long believed one way to stop the Earth’s air from warming is by planting more trees. The idea is that more trees will take in or absorb(吸收) some of the CO2 in the air. CO2 is a gas released by cars, factories and other human activities. The gas traps heat in the Earth’s air, which warms the planet. However, two new studies have found that trees may not be as helpful in reducing CO2 as thought.

The first study was done at Duke University in Durham, North Carolina. Researchers pumped(打气) extra CO2 into a test area where green trees were growing. The trees grew thirty-four percent faster during the first three years. However, in time, the trees slowed to about their normal growth rate. The scientists say this is because trees need other nutrients(营养素), such as nitrogen(氮).

In the second study, researchers from Duke and Bowdoin College in Brunswick, Maine examined the soil(泥土) around trees. They discovered that as the leaves broke down into the soil, all the carbon was not trapped in the soil. Much of it was let into the air as CO2.

The findings of the two studies were published last month in Nature magazine. They suggest there is limited(有限的) value in planting trees to reduce the CO2 pollution in the air.

Forest planting has been a part of negotiations(谈判) on a world agreement to reduce greenhouse gases that scientists believe cause global warming. The United States, Canada, Japan and some other countries have supported the idea. But this new research suggests the idea is not as effective as environmental activists(积极分子) had thought. Scientist Ram Oren of Duke University led the study on tree growth. He says that earlier estimates(估计) on the ability of forests to absorb CO2 were overly hopeful.

Some other scientists say the research provides some of the first evidence on how trees react(反应) to CO2. Some other scientists say the research disputes(质疑) a belief among some coal and power companies. The companies say that more CO2 in the air will not create harmful global warming. Instead, they say it will increase forests and other plants.

1.Why did the researchers put trees in extra CO2 in the first study?

A. To learn whether trees can still absorb CO2 under extreme conditions.

B. To get more oxygen from these trees.

C. To know how much CO2 that trees can absorb.

D. To see the effect of CO2 on the growth rate of these trees.

2.What happened to the leaves falling from the trees in the second study?

A. They broke down and the main parts turned into oxygen.

B. They broke down and the carbon had mainly turned into CO2.

C. They broke down and the carbon was mainly absorbed in the soil.

D. They absorbed more CO2.

3.Scientist Ram Oren thinks that common beliefs of the tree’s ability to absorb CO2 are __________.

A. just right　　 　　　　 B. not acceptable

C. a bit too cheerful　 D. too dangerous

九年级英语阅读理解中等难度题查看答案及解析

Zhong Nanshan is one of the prime medical scientists in the 21st century. After graduating from Beijing Medical College in 1960, he has been working in the medical field for almost 60 years. He is a good doctor in the patients' eyes and a kind teacher in his students' as well. In the spring of 2003.the SARS broke out (爆发) in China and spread across the world. Zhong Nanshan not only took an active part in but also led the fight against SARS. At that time no one really know much about SARS and most people didn't know how to protect themselves from getting the disease. Thanks to him, quite a lot of people were saved. This time in 2020, Zhong Nanshan still played the same role in fighting against COVID-19 (新冠病毒) He worked hard day and night treating patients. Meanwhile, he told the fact that teamwork among nations could save lives. Through their hard work for several months, Zhong Nanshan achieved a great success-saving China. Until now the COVID-19 has been gradually stopped in China.

任务 5: 根据短文（C）内容完成表格，每空一词。

九年级英语填空中等难度题查看答案及解析

A group of students from the US have been in China for a week. Here is part of their chat history (聊天记录) on WeChat.

20:45

　　　　 Hi, everybody! Anything to share today?

20:49

　　　　 Yes. I went to a restaurant to have dinner with some friends this evening.

When we finished the meal, the waiter brought us the bill. It was 270 yuan.

We gave him 300 yuan and left 30 as a tip(小费) for his service(职务).

To our surprise, he returned us the change!

　　　　 Really? How kind he is!

20:53

　　　　 @Sunny It’s different form that of the US. I worked in a restaurant in my free time. I accepted tips. Well, something interesting happened to me this morning…

20:55

　　　　 I couldn’t find the bus stop. I came up to a man who was walking near me and showed him the bus number. He nodded and asked me to follow. We walked for about 10 minutes and finally got to the bus stop. I wanted to give him a hug (拥抱) to show thanks, but he just said goodbye and walked away. I couldn’t believe that he had taken so much trouble for a stranger(陌生人)!

　　　　 It seems that Chinese people don’t usually hug.

　　　　 I guess so. It’s really unforgettable!

21:02

　　　　 I agree. The Chinese people I have met these days are all so friendly, polite

And helpful. Well will enjoy the rest of our trip for sure.

1.How much was Sunny’s bill?

_____________________

2.Did Stone find the bus stop in the end?

_____________________

3.What are the group of students mainly talking about?

_____________________

4.Do you think it is necessary for Sunny to give tips for the service? Why or why not?

_____________________

九年级英语回答问题中等难度题查看答案及解析

Stephen Hawking, one of the world's most famous scientists, believed that humans will one day have to move into space, "Once we step into space, our future should be safe," he said.

Today, many countries are all planning to send astronauts to Earth's closest neighbor: the moon. Some of these countries want to create space stations there within the next 10 years. These stations will prepare humans to visit and later live on Mars or other earthlike planets.

__①__ Robert Zubrin, a rocket scientist, thinks humans should colonize(殖民) space. He wants to start with Mars. Why? He thinks sending people to Mars will allow us to learn a lot of things—for example, the ability of humans to live in a very different environment. Besides, any progress we make in the fields of science, technology, medicine. and health will do good to people here on Earth.

__②__ Elon Musk, the CEO of Space X also believes we should colonize Mars. His long-term goal is to put one million people there if something bad happens to us here on Earth.

__③__ Many people say it's too expensive. Also, most space trips are not short. A one-way trip to Mars, for example, would take at least six months. People traveling this kind of distance could face many health problems. Besides, these first people would find life especially difficult in space. On the moon's surface, for example, the sun's rays are very dangerous. People would have to stay indoors most of the time.

__④__ No matter what different concerns there are, sending people into space seems certain. In the future, we might see cities on the moon or even new human cultures on other planets. First stop: the moon.

1.According to the passage, why are some countries planning to build space stations?

A.To develop space travel. B.To learn more about the moon's surface.

C.To prepare humans to live on other planets. D.To cut down the number of people living on Earth.

2.Which is the best place for the sentence "Not everyone thinks sending humans into space is a smart idea. "?

A.① B.② C.③ D.④

3.What is the purpose of this passage?

A.To give reasons for and against colonizing space.

B.To describe what life would be like on the moon.

C.To compare the environments of Mars and the moon.

D.To introduce progress in space science and technology.

九年级英语阅读单选困难题查看答案及解析

阅读下文并回答问题。

A group of students from the US have been in China for a week. Here is part of their chat history (聊天记录) on WeChat.

20:45

Hi, everybody! Anything to share today?

20:49

Yes. I went to a restaurant to have dinner with some friends this evening.

When we finished the meal, the waiter brought us the bill. It was 270 yuan.

We gave him 300 yuan and left 30 as a tip(小费) for his service(职务).

To our surprise, he returned us the change!

Really? How kind he is!

20:53

@Sunny It’s different form that of the US. I worked in a restaurant in my free time. I accepted tips. Well, something interesting happened to me this morning…

20:55

I couldn’t find the bus stop. I came up to a man who was walking near me and

showed him the bus number. He nodded and asked me to follow. We walked for

about 10 minutes and finally got to the bus stop. I wanted to give him a hug (拥抱)

to show thanks, but he just said goodbye and walked away. I couldn’t believe that he

had taken so much trouble for a stranger(陌生人)!

It seems that Chinese people don’t usually hug.

I guess so. It’s really unforgettable!

21:02

I agree. The Chinese people I have met these days are all so friendly, polite

And helpful. Well will enjoy the rest of our trip for sure.

1.How much was Sunny’s bill?

_________________________________________________________________

2.Did Stone find the bus stop in the end?

_________________________________________________________________

3.What are the group of students mainly talking about?

_________________________________________________________________

4.Do you think it is necessary for Sunny to give tips for the service? Why or why not?

_________________________

九年级英语回答问题困难题查看答案及解析

C

Indian scientists have designed a new device* that they hope will solve one of the biggest problems with the use of solar energy. They call the device a solar tree. Solar trees have metal “branches*” which are just from a tall pole at different levels. Each branch holds a solar panel*. These panels have large metal boards that collect energy from the sun and turn it into electricity.

Daljit Singh Bedi is the main scientist at the Council of Scientific and Industrial Research in India. Bedi says the shape of the solar trees makes it possible to fit more solar panels in a space than traditional systems do. This means less land would be needed to produce solar energy. “It takes about four square meters of space to produce energy which may need 400 square meters of space,” he says.

Scientists believe the energy a solar tree collects will be enough to power five homes. The solar tree will make it easier to provide solar energy for homes in cities. The trees will also take less space from farmers in rural areas. Bedi says solar trees will collect more energy than normal solar panels on the tops of buildings. “This design makes the solar panels exposed* more towards the sun,” he says. “And that way people are able to use 10 to 15 percent more energy.”

India has promised to reduce its greenhouse gas production. The country’s promise depends heavily on increasing solar energy. The cost of solar panels has gone down in recent years. This has increased the possibility of applying*solar trees in India.

Amit Kumar is the senior director of the Energy and Resources Institute in New Delhi. He says gaining access* to land takes time and increases costs. He adds that it is still not clear how useful these new developments in solar power technology are. “Only when we put those trees on a large scale* will we be able to get that answer,” he says.

1.We may probably read this passage in ___________.

A. Culture Views　　 B. Nature and Science

C. Story Books　　 D. Travelling Guide Book

2.Compared the traditional system, the main advantages of the solar tree is _____________.

A. we can see many “branches” in new solar tree

B. it surely produces more energy than traditional system

C. it’s reducing India’s more greenhouse gas production now

D. fewer and fewer people will use it than traditional ones

3.What does the underlined word "this" in the fourth paragraph refer to (指代)？

A. greenhouse gas production　　 B. the solar panels

C. the new solar tree　　 D. country’s promise

4.In the last paragraph, what do you think of what Amit Kumar said?

______________________________________________________________________________

九年级英语阅读理解困难题查看答案及解析

完成表格:阅读下面短文,根据其内容,完成表格中所缺的信息。

What will life be like in 50 years? A group of experts from the UK have painted us a picture-a report on life in the future. By 2069, according to the report, the digital revolution(电子革命) will have greatly changed the world. It will be like what the Industrial Revolution did 250 years ago. What impossible things will become possible? Let's take a look.

Underwater highways

They will be built under the sea. People will travel in pods(吊舱) through underwater tubes (管道). It will take less than an hour to travel between the UK and mainland Europe.

Flying taxis and buses

To stop traffic jams, people might take flying taxis and buses .For long-distance travel, they might take super-fast rockets.Travel time between London and New York could be just 30 minutes.

Space hotels

Don't know where to go during the holiday? Outer space might be a good place. People will have fun in space hotels. These hotels will be built near the moon or the planets of our solar system.

Self-cleaning homes

Future homes might clean themselves while you're at school or work, or while you sleep. It could be as easy as pressing a button.

Insect-burgers昆虫汉堡

Insects will become our main food: They are rich in protein(蛋白质) . People can make them into burgers and biscuits. People can breed more insects in their kitchens.

Underground skyscrapers

You could call them“earth-scrapers”. They are underground buildings . During an earthquake, these buildings would not fall over like normal skyscrapers.

九年级英语信息匹配中等难度题查看答案及解析