2 . As the effects of climate change become more disastrous, well-known research institutions and government agencies are focusing new money and attention on an idea: artificially cooling the planet, in the hopes of buying humanity more time to cut greenhouse gas emissions.

That strategy, called solar climate intervention (干预) or solar geoengineering, involves reflecting more of the sun’s energy back into space — abruptly reducing global temperatures in a way that imitates the effects of ash clouds flowing out from the volcanic eruptions. The idea has been considered as a dangerous and fancied solution, one that would encourage people to keep burning fossil fuels while exposing the planet to unexpected and potentially threatening side effects, producing more destructive hurricanes, wildfires floods and other disasters.

But. as global warming continues, producing more destructive hurricanes, wildfires floods and other disasters, some researchers and policy experts say that concerns about geoengineering should be outweighed by the imperative to better understand it, in case the consequence of climate change become so terrible that the world can’t wait for better solutions.

One way to cool the earth is by injecting aerosols (气溶胶) into the upper layer of the atmosphere. where those particles reflect sunlight away from the earth. That process works, according to Douglas MacMartin, a researcher at Cornell University.

“We know with 100% certainty that we can cool the planet,” he said in an interview. What’s still unclear, he added, is what happens next. Temperature, MacMartin said, is an indicator for a lot of climate effects. “What does it do to the strength of hurricanes?” he asked, “What does it do to agriculture production? What does it do to the risk of forest fires?”

Another institution funded by the National Science Foundation will analyze hundreds of simulations of aerosol injection, testing the effects on weather extremes around the world. One goal of the research is to look for a sweet spot: the amount of artificial cooling that can reduce extreme weather events without causing broader changes in regional rainfall patterns or similar impacts.

1. Why do researchers and government agencies work on cooling the earth?

A．To prevent natural disasters.	B．To win more time to reduce gas emissions.
C．To imitate volcanic eruptions.	D．To encourage more people to bur fossil fuels.

2. What are researchers worried about in terms of global warming?

A．More volcanoes will throw out.

B．More solar energy will go into space.

C．More disasters will endanger the future of the world.

D．People will keep burning fossil fuels to keep warm.

3. What can be inferred from Douglas’ words in an interview?

A．He thinks more research remains to be done.

B．He is optimistic about the effect of cooling the earth.

C．He is concerned about the reduction in agriculture production.

D．He disapproves of the practice of solar climate intervention.

4. What does the underlined words “sweet spot” in the last paragraph mean?

A．The rainfall pattern of a region.

B．The modest drop in temperature.

C．The number of extreme weather events.

D．The injection amount of aerosol.

3 . If you visit Uluwatu temple in Bali, be cautious. The long-tailed temple monkeys there are well-known thieves. Since a long time ago, they have made a living by robbing visitors of their possessions and then holding those objects until a ransom in the form of food is paid. But Jean-Baptiste Leca of the University of Lethbridge, in Canada, wondered whether these monkeys are cleverer still. Sometimes, they do not accept the first offer and hold out for more. He therefore asked himself whether they are able to assess how valuable an object is to its owner, and factor that into their negotiations.

Dr. Leca and his colleagues conducted their experiment by wandering around the temple with video cameras, recording the activities of the monkeys. Every time they saw a monkey show interest in a particular tourist? they recorded the interaction. To work out what was going on, they had first to establish the relative values of food rewards to monkeys, and of stealable objects to people.

To confirm which stealable objects are most valued by people, they divided them into six classes: empty containers, such as phone cases and plastic bottles; accessories (搭配物) such as hairpins and key rings; hats and shoes; spectacles and sunglasses; and electronics and wallets. They then observed how often victims bothered to bargain with the thief for the return of property belonging to different classes, and thus classified objects into low value, medium value and high value.

They found that monkeys do, indeed, have a complicated sense of what they are doing — at least, adults and sub-adults do. These animals have a preference for stealing high-value items, and will often hold out either for more rewards, or for better ones, if they are in possession of such items. But this is something that they have to learn how to do as they grow up. Young monkeys make no such distinctions, and sub-adults are less good at doing so than adults.

1. What is the purpose of Leca's research?

A．To prove monkeys are cleverer than men.

B．To find out what is valuable for monkeys.

C．To record the negotiations between monkeys.

D．To make sure monkeys can judge item values.

2. What does the underlined word "ransom" in Paragraph 1 mean?

A．Bilk.

B．Reward.

C．Tax.

D．Rent.

3. How are the values of objects classified in Paragraph 3?

A．By the material of objects.	B．By the preference of victims.
C．By the buying price of objects,	D．By the frequency of bargaining.

4. What can we infer from the last paragraph?

A．Young monkeys can evaluate items.	B．All monkeys prefer high-value items,
C．Monkeys have a simple sense of acts.	D．Monkeys' stealing is an acquired skill.

4 . Social Networking Sites: Are They Changing Human Communication?

It is hardly news that people are using the Internet to communicate with others more and more. Some people fear that someday we will no longer feel the need to talk to one another face to face. However, some recent studies suggest that people communicate, or stay in touch, even more than they used to. Whichever side you fall on, what is clear and without a doubt is that human communication has changed in the 21^st century. But results of recent scientific studies may have us reconsider just how much our new communication forms have changed our world.

In June 2008, a British psychiatrist, Himanshu Tyagi, warned that communicating on social networking sites could have a negative effect on the generation of people born after 1990. This generation has never known a world without the Internet. Tyagi says that these people use the Internet to communicate with others so much that they may have trouble forming real relationships. Tyagi is concerned that people may start and end relationships over the Internet. Describing the Internet he said, “It’s a world where everything moves fast and changes all the time, where relationships are quickly ended at the click of a mouse.”

Another psychologist, Dr. Aric Sigman, warned of the physical effects that come with using social networking sites. He suggests that the reduction in the amount of time we spend interacting (互动交流) with people face to face could have biological effects on the human body. The results of his study suggest that, without real personal interaction, the body does not react the same way it would if people were meeting face to face. As a result, immune responses, even hormone levels, can be changed. These changes may lead to the development of illnesses, such as cancer.

Despite these warnings, studies can be found that show the positive sides of social networking sites. The results of one study show that using social networking sites has increased the self-esteem (自尊心) of young adults. Another suggests that college students using these sites feel more “connected” with people when they use them. In addition to scientific studies, there are many who feel that the benefits of social networking sites outweigh the possible negative sides. Many people, especially those who spend a lot of time at home, for various reasons, find the Internet a lifeline. They are able to communicate with many people using these sites.

Perhaps the key to this new communication style is self-control and common sense. If someone spends all of his time on the Internet, and never actually sees friends face to face, that seems like an unhealthy way to live. But if someone spends time on the Internet, some of which is spent arranging meetings for “real” time together, then it seems almost complementary (互补的). Balance is the key to keeping communication alive and well in the 21^st century.

1. Which of the following ideas may Himanshu Tyagi agree with?

A．Social networking sites harm people of all ages.

B．The Internet weakens young people’s relationships.

C．The use of the Internet improves people’s immune system.

D．The online world pushes people to live a faster and better life.

2. What is Dr. Aric Sigman’s major concern about using social networking sites?

A．It will stop the face-to-face interaction.

B．It reduces the self-esteem of young adults.

C．It may cause some serious health problems.

D．It makes people feel less connected with others.

3. What does the underlined word “outweigh” in Paragraph 4 probably mean?

A．Are greater than.	B．Are heavier than.
C．Are more effective than.	D．Are more difficult than.

4. Which of the following shows the development of ideas in this passage?
CP: Central Point   P: Point     Sp: Sub-point(次要点)   C: Conclusion

A．	B．
C．	D．

5 . We recognize our friends’ faces. And we’re not alone. Many social animals can identify individuals of their own species by features of their faces. That's important, because they need to be able to change their behavior depending on who they meet. And a recent research has shown that some species of monkeys, birds, and domesticated (家养的) animals can even tell different faces apart by looking at photographs alone.

Ethologist Léa Lansade of the French National Research Institute for Agriculture, Food and Environment did an experiment to find out how well horses can recognize individual people in photographs.

She and her team first taught the horses how to “choose” between two side-by-side pictures by touching their noses to a computer screen. The horses were then shown photos of their present keeper alongside faces of unfamiliar humans. They had never seen photos of any of the people before. The horses correctly identified their current keeper and ignored (忽视) the stranger’s face about 75%of the time. In fact, even though the horses didn't get it right every single time, they were at least as correct in picking out their earlier keeper as they were at identifying their present one.

The results suggest that not only can horses differentiate between familiar and unfamiliar human faces, they also naturally understand that photographs are two dimensional representations (二维呈现) of real life, without any other intimations such as smell or sound. And they’re even better at this than our oldest animal parter, the domestic dog.

In addition, horses seem to have a strong long-term memory for human faces, like their long lifespan and history of domestication. In future experiments, the researchers would like to test whether looking at photos of people that they have had bad experiences with in the past might cause horses to act anxious or even avoidance. So maybe think twice before doing anything that might give a horse a long face.

1. Why did researchers show the horses both the keeper’s photos and the strangers’?

A．To find out what horses would do in the experiment.

B．To see why horses could recognize the keeper in the pictures.

C．To test whether horses could recognize the strangers in pictures.

D．To study to what degree horses can make out different people in pictures.

2. What does the underlined word “intimations” in paragraph 4 refer to?

A．Clues.	B．Differences.
C．Photographs.	D．Senses.

3. What are researchers still uncertain about?

A．Whether horses can live longer than other animals.

B．Whether horses can remember human's faces for a long time.

C．Whether horses can show their emotions at the sight of photos.

D．Whether horses are better at recognizing photos than other animals.

4. What is the purpose of the text?

A．To talk about animals’ species.

B．To explain animals’ facial features.

C．To show animals’ behaviour for adaptation.

D．To introduce animals’ ability to identifying faces.

6 . Round and Round They Go

Space is becoming more crowded. Quite a few low-Earth-orbit (LEO) satellites have been launched into the sky, which are designed to move around the Earth only a few hundred kilometres above its surface. SpaceX and OneWeb plan to launch LEO satellites in their thousands, not hundreds, to double the total number of satellites in orbit (轨道) by 2027.

That promises to change things on Earth. LEO satellites can bring Internet connectivity to places where it is still unavailable. This will also be a source of new demand for the space economy. Morgan Stanley, a bank, projects that the space industry will grow from $350 billion in 2016 to more than $1.1 trillion by 2040. New Internet satellites will account for half this increase.

For that to happen, however, three worries must be overcome. Debris (碎片) is the most familiar concern. When enough satellites were packed into low-Earth orbits, any collision (碰撞) could cause a chain reaction which would eventually destroy all spaceships. One solution is to grab the satellites with problems and pull them down into the Earth’s atmosphere. Another is to monitor space more closely for debris. But technology is only part of the answer. Rules are needed to deal with old satellites safely from low-Earth orbits.

Cyber (网络的)-security is a second, long-standing worry. Hackers (黑客) could take control of a satellite and steal intellectual property, redirect data flows or cause a collision. The satellite industry has been slow to respond to such concerns. But as more of the world’s population comes to rely on the space for access to the Internet, the need for action will intensify. Measures will surely be taken to protect network security.

The third issue follows from the first two. If there is a simple mistake or a cyber-attack, it may cause a chain reaction which wipes out hundreds of billions of dollars of investment. Who is responsible for that? Now the plans of firms wishing to operate large numbers of satellites are being studied. But there is a long way to go before the risks are well understood, let alone priced.

As space becomes more commercialized, mind-bending prospects open up: packages moved across the planet in minutes by rocket rather than by plane, equipment sent to other small planets, passengers launched into orbit and beyond. All that and more may come, one day. But such activities would raise the same questions as LEO satellites do. They must be answered before the space economy can truly develop.

1. What can we learn about LEO satellites from the passage?

A．They are supposed to limit the space economy.

B．They are expected to increase in large numbers.

C．They are designed to move beyond the Earth as far as possible.

D．They are mainly intended to bring Internet connectivity to remote areas.

2. To deal with debris in space, the author suggests _______.

A．depending entirely on the modern technology

B．monitoring the movement of spaceships carefully

C．strengthening rules to remove old satellites safely

D．destroying all the satellites with problems instantly

3. What does the underlined word “intensify” in Paragraph 4 probably mean?

A．Measure.

B．Increase.

C．Spread.

D．Repeat.

4. What is the author’s attitude toward the launch of LEO satellites?

A．It should be further confirmed for its ownership.

B．It should be continued because of its advantages.

C．It should be done carefully to avoid potential risks.

D．It should be stopped in face of the space economy.

7 . Described as the world’s most environmentally friendly protein（蛋白质）, Solein is made by applying electricity to water to release bubbles of carbon dioxide and hydrogen. Living microbes (微生物) are then added to the liquid to feed on the carbon dioxide and hydrogen bubbles and produce the Solein, which is then dried to make the powder. It’s a chemical change process similar to beer brewing. The dried Solein has a protein content of 50 percent and looks and tastes just like wheat flour.

“It is a completely new kind of food, a new kind of protein, different to all the food on the market today in how it is produced as it does not need agriculture.” Dr Pasi Vainikka, the chief manager of Solar Foods told The Guardian. The process used to produce Solein—changing hydrogen and carbon dioxide is amazing, as the wonder food can be produced anywhere in the world. It’s also 10 time-efficient than photosynthesis (光合作用), and 10 to 100 times more environment and climate-friendly in water use than animal or plant-based food production.

“Solein also contains all the essential amino acid (氨基酸),but because it is produced using carbon and electricity, it does not require large amounts of land to produce, ” the Solar Foods website explains. “Another unique characteristic of Solein is that it is able to take carbon directly from carbon dioxide without needing a source of sugar.”

While Solar Foods does not expect Solein to challenge conventional protein production methods in the next two decades, it does expect it to become a “new harvest” for humanity, which is significant considering so far we have only relied on plants and animals for sustenance. The Helsinki-based company plans to open its first Solein factory at the end of 2021 and increase production to two billion meals per year by 2022.

1. Why is Solein described as environmentally friendly?

A．Because it is man-made by using electricity.

B．Because it contains all the nutrition people need.

C．Because it is made consuming less land and energy.

D．Because it is produced from water and carbon dioxide.

2. What does Solar Foods expect of Solein?

A．It’ll have a rewarding future.

B．It’ll reach consumers in 2020.

C．It’ll challenge traditional protein production.

D．It’ll be a complete replacement for plants and animals.

3. What does the underlined word “sustenance” in last paragraph mean?

A．survival	B．food
C．material	D．support

4. Where is this text most likely from?

A．A textbook.	B．A novel.
C．A magazine.	D．A brochure.

8 . Many of us spend part of each day surrounded by strangers, whether on our daily commute(上下班往返), or sitting in park or cafe. But most of them remain just that-strangers. However, new evidence has shown that plucking up(鼓起) the courage to strike up conversation might be good for our health.

Nicholas Epley from the University of Chicago and Juliana Schroeder from the University of California are behavioral(行为的) scientists. They wanted to know whether solitude is a more positive experience than interacting with strangers, or if people misunderstand the consequences of distant social connections. They found that many people feel uncomfortable and frightened talking to others and their research suggested that when we make an initial conversation “we consistently underestimate(低估) how much a new person likes us.” It seems we think that all the things could go wrong and why someone wouldn't want to talk with us.

Their research involved an experiment with a group of Chicago commuters and found that"every participant in our experiment who actually tried to talk to a stranger found the person sitting next to them was happy to chat."From this and other research,the conclusion is that connecting with strangers is surprisingly pleasant and it has a positive impact on our well-being.It's true that talking can make you feel happier and happiness can lead to better mental health.

However, if you're an introvert(性格内向者），the thought of speaking to someone new might make you anxious. But the American research found “both extroverts(性格外向者) and introverts are happier when they are asked to behave in an extroverted manner.” So maybe, if you're a loner, it’s time to come out of your shell and make some small talk with a stranger-it could be the beginning of a new friendship.

1. What does the underlined word “solitude” in paragraph 2 mean?

A．Being calm.

B．Being pleasant.

C．Being alone.

D．Being healthy.

2. Why might we not want to speak to a stranger?

A．Because we don't trust a new person.

B．Because we can't find a common topic.

C．Because we like distant social connections.

D．Because we feel the stranger may dislike us.

3. What could help start a new friendship?

A．Making a small talk.

B．Sitting next to a stranger.

C．Sharing personal details.

D．Behaving in polite manner.

4. Which of the following is the best title for the text?

A．How to be an extrovert.

B．Talking to strangers.

C．How to speak to strangers.

D．Making new friends.

9 . Though leaders from the International Olympic Committee(IOC)have announced a first-of-its-kind postponement of the Tokyo Summer Olympics because of the corona virus epidemic,people all over the world are still concerned about its preparations.Officials from the Tokyo Olympic Committee say they are sparing no effort and announce the Tokyo Summer Olympics in 2021 is going green.The 5,000 medals Japan has made are more special than most.

One novel focus of the Tokyo Olympics is to be"sustainable”－to avoid using too many natural resources,so that the games are easy on the environment.As part of this goal,the organizers decided to make all of the Olympic medals out of metal recycled from old electronics.

Almost all electronics are made with small amounts of"precious metals",like gold and silver.But collecting enough of these metals to make 5,000 medals was a huge challenge.That's because the amount of metal in each device is tiny.It would take about 20,000 cell phones to get just l kilogram of gold.

Beginning in April 2017,the organizers placed collection boxes around the country,and asked people to turn in their old electronic devices.Soon people began to respond to the initiative(倡导），turning in smart phones,digital cameras,handheld games,and laptops.At first,collection went slowly,but soon more and more   areas began to take part.By the end,1,621 local governments had helped out with the collection process.

Then came the job of breaking those devices down into smaller pieces.After eing taken apart and sorted, the small electronics were smelted(熔炼）to get all the gold,silver,and bronze elements.This is a tricky job, which calls for careful attention and good skill.It's also dangerous,because some of the metals and other things aren't safe for people to touch or breathe.

By the end of March,2019,the organizers had hit their targets of getting enough metal for the medals. They had collected around 32 kilograms of gold,4,100 kilograms of silver and 2,200 kilograms of bronze.And now all the 5,000 medals are available for the would-be winners.

1. What can we know about the Tokyo Olympics medals?

A．They are hugely valuable.

B．They are of high quality.

C．They are made from e-waste.

D．They are designed uniquely.

2. What does Paragraph 4 mainly tell us?

A．The difficulty of making the medals.

B．The initiative to recycle used smart phones.

C．The classification of the collected devices.

D．The process of collecting old electronics.

3. The underlined word “tricky” in Paragraph 5 means"

A．creative

B．demanding

C．well-paid

D．time-consuming

4. What's the purpose of Tokyo's way of making the medals?

A．To advocate sustainable use of resources.

B．To promote the spirit of Olympic Games.

C．To introduce a new technique to make medals.

D．To show the gravity of environmental damage.

10 . Doctors in hospital emergency rooms often see accidental poisonings. A frightened parent arrives with a child who swallowed a cleaning liquid. Or perhaps the harmful substance is a medicine. Or it might be a chemical product meant to kill insects. These are common causes of accidental poisoning.

In cases like this, seek medical help as soon as possible. Save the container of whatever caused the poisoning. And look on the container for information about anything that stops the effects of the poison. Save anything expelled from the mouth of the victim. That way, doctors can examine it.

Millions of people know a way to save a person who is choking on something trapped in the throat. The method is commonly known as the Heimlich Maneuver or abdominal thrusts(腹部按压), which you can do by getting directly behind a sitting or standing person. Put your arms around the victim’s waist. Close one hand to form a ball. Place it over the upper part of the stomach, below the ribs. Place the other hand on top. Then push forcefully inward and upward. Repeat the abdominal thrusts until the object is expelled from the mouth. For someone who is pregnant or very fat, place your hands a little higher than with normal abdominal thrusts.

Red Cross experts say taking these steps can save many lives. But they also warn that abdominal thrusts are not for people who have almost drowned. They say use of the method could delay other ways to re-start breathing in the victim. Abdominal thrusts should be used only in cases where a near-drowning victim is choking on an object.

To learn more about first aid, ask a hospital or organization like a Red Cross or Red Crescent Society for information. There may be training classes offered in your area.

1. According to the first paragraph, which of the following is NOT the common cause of accidental poisonings?

A．A harmful medicine

B．A cleaning liquid

C．Poisonous insects

D．Dangerous pesticide(杀虫剂)

2. The underlined word “expelled” in paragraph 2 can be replaced by “_________ ”.

A．coming out	B．taking up
C．going away	D．getting down

3. Why abdominal thrusts are not for people who have almost drowned?

A．Because people are unwilling to attempt rescue efforts

B．Because it is hard to perform

C．Because it is no need to do so

D．Because it could hold up other ways to re-start breathing in the victim

4. What is the author’s purpose in writing this text?

A．To promote medical research

B．To share some knowledge about first aid

C．To show how to perform abdominal thrusts

D．To help people deal with accidental poisoning