1 . Deserts could be the best places on Earth for harvesting solar power. They are spacious, relatively flat, and never short of sunlight. So researchers imagine it might be possible to transform the world’s largest desert, the Sahara, into a large solar farm, capable of meeting four times the world’s current energy demand.

While the black surfaces of solar panels absorb most of the sunlight that reaches them, only around 15% of that incoming energy gets turned into electricity. The rest is returned to the environment as heat, affecting the climate. If these effects were only local, they might not matter in a thinly populated desert. But the area of the installations in the Sahara would be vast, covering thousands of square miles. Heat released from an area this size will be redistributed by the flow of air in the atmosphere, having regional and even global effects on the climate.

A 2018 study used a climate model to assess the effects of building massive solar farms in the Sahara. The model revealed that when the size of the solar farm reaches 20% of the total area of the Sahara, the heat released by the darker solar panels creates a big temperature difference between the land and the surrounding oceans that ultimately lowers surface air pressure and causes wet air to rise and condense (凝结) into raindrops. With more rainfall, plants grow and the desert reflects less of the sun’s energy since vegetation absorbs light better than sand and soil. With more plants present, more water is evaporated (蒸发), creating a better environment that causes vegetation to spread.

So, a large solar farm could generate enough energy and at the same time turn one of the most abominable environments on Earth into a habitable place. Sounds perfect, right? Not quite. In a recent study, we used an advanced Earth system model to closely examine how Saharan solar farms interact with the climate. It showed there could be unintended effects in remote parts of the land and ocean.

We are only beginning to understand the potential consequences of establishing massive solar farms in deserts. Solutions like this may help society reduce the use of fossil energy, but Earth system studies like ours underscore the importance of considering the numerous coupled responses of the atmosphere, oceans, and land surface when examining their benefits and risks.

1. What can be learned about solar farms?

A．They are mainly located in deserts.

B．They can affect the local and even global climate.

C．They can make the best use of incoming energy.

D．They satisfy the world’s current energy demand.

2. What will happen if 20% of the Sahara is covered with solar panels according to the 2018 study?

A．It might become greener.

B．It might reflect more sunlight.

C．Its surface air pressure will increase.

D．Its temperature difference between day and night will decrease.

3. What does the underlined word “abominable” in paragraph 4 mean?

A．Addictive.

B．Dynamic.

C．Sensitive.

D．Unpleasant.

4. What does the author think of turning the Sahara into a solar farm?

A．It is an impossible task.

B．It will do more good than harm.

C．It calls for more consideration.

D．It might be the solution to fossil fuel pollution.

2 . 阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。续写的词数应为150左右。

On a cold winter day years ago, I slipped in the snow in the wilderness and broke my legs. As I lay on the ground, unable to move my body, I believed I was fated to freeze to death. My dog, Becky, however, didn't run away. Instead, she determined to save me. She lay on top of me to keep me warm for many hours, barking continually until help arrived, long after I lost consciousness. Eventually, I was saved.　　

A few cold winters later, Becky was discovered to have a baseball-sized lump (肿块) on her belly. Before long, my husband Bob took Becky for surgery to remove the lump. To take care of my babies, I had to stay at home, filled with anxious thoughts. After her surgery, when Bob left to pick her up, it was snowing heavily. Becky could barely walk, so Bob carried her.　　

They couldn't get in the door easily because Becky was wearing a big, hard plastic cone(圆锥体) around her neck to prevent her from licking her sutures (伤口缝合线). I held the door wide open. She was sad and crying. There was snow inside her cone. It took over five minutes to get them in because Becky shook her head wildly to try to remove the cone. The sound of the con e hitting the door made her panic and cry even louder.　　

Once inside, she was so frightened that she kept her tail between her legs. She thought she had done something wrong. Her expression said, “I’m sorry for what I did that led to me having to wear this.” Because of her surgery, Becky wouldn't take her special treat of a cube of cheese. She wouldn’t sit or lie down. All she did was stand and cry. “How long will she have to wear it ?” I asked. “Two weeks,” Bob replied.

“It’s my turn to take good care of her, just as she did for me years ago,” I thought.

Paragraph 1:

Then, I stayed with her on the floor, helping her get through her firs tough night.

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Paragraph 2:

Eventually, the day arrived when Bob took her to have her sutures removed.

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3 . Imagine a world where nothing ends up in landfill. Instead, everything can be reused and recycled, creating products that never reach their “end of life”. According to a recent report by the Circle Economy Foundation, only 7.2% of all used materials are being cycled back to be reused and recycled without creating waste.

An Italian company aims to change this by creating furniture products made from a plastic-like biomaterial, which is fully organic and biodegradable (可生物降解的), and can be used over and over again. Using fruit peel, orange seeds and coffee grounds collected from businesses in Italy, the company can redistribute products to the same businesses for use in their offices, instead of furniture made from common plastic. If, by mistake, any of the material ends up in the ocean, it doesn’t produce any microplastics.

Each product is made through a four-step process. First, the food waste is dried and crushed into a very fine powder. Then, the powder is mixed with a biodegradable plastic alternative known as polyhydroxybutyrat (PHB), with the fruit waste making the PHB more study (坚固的). The material is then turned into a filament (细丝) and, using a spool, put into a 3D printer.

Because a lot of food waste would be buried and incinerated in the landfill, which would produce lots of carbon dioxide, Reusing fruit peel and coffee grounds decrease carbon dioxide from the production of plastic, according to the director of operations in the company. He adds that the biomaterial is as sturdy as wood, and won’t begin to break down unless it’s touched by water, bacteria or acidity.

Despite its eco-friendly benefits, the biomaterial is expensive. It costs probably six times more than common plastic, and it is a very difficult and expensive process, so this is why many companies aren’t doing it.

However, the director is hopeful that in a few years, as-more consumers and businesses are forced to face the damage that unsustainable plastic is doing to the planet, the biomaterial will be much more widely used. “We really believe this is the material of the future,” says the director. “Little by little, a step at a time.”

1. What is a problem faced by the current world according to paragraph 1?

A．Pollution is becoming milder.

B．The rate of recycling is too low.

C．Plastic poses a threat to the ocean.

D．New material needs to be improved.

2. What do we know about the biomaterial?

A．It is of benefit to the environment.

B．It is cheaper than common plastic.

C．It is given a welcome by businesses.

D．It has gradually replaced common plastic.

3. What does the underlined word “incinerated” in paragraph 4 refer to?

A．Damaged.

B．Burned.

C．Selected.

D．Recovered.

4. Which can be the best title for the text?

A．New Material: One Way To Regain Fruit Peel

B．From Landfill To Furniture: The Journey Of Furniture

C．Sustainable Material: The Future Of Eco-Friendly Furniture

D．Italian Businesses Using New Strategies To Manage Industrial Waste

4 . Maples are known for their autumn colors. Many species put on a display of oranges, browns, yellows, and reds every year. Here are four excellent species of maple for your landscape.

Bigleaf maple
Native Area: North America
Height: 50 to 100 feet

As the name suggests, the leaves are quite large on this tree. It has the biggest leaves of any maple; the classic palm-shape leaves can be over 12 inches wide. This large tree is an excellent shade tree for large landscapes and parks.

Hedge maple
Native Area: Europe and Asia
Height: 25 to 35 feet

The hedge maple is a great choice for the urban garden, as it does well in many severe environments: drought, salty soils, shady locations, and climates where there is ozone deficiency. It can also be used as a street tree if the power lines are high enough.

Norway maple
Native Area: Europe and Asia
Height: usually 40 to 50 feet

Known either as Norway maple or European maple, this popular species was brought to North America from Europe in the 18th century. It has since become one of the most common trees. In the right settings, this species may become invasive (侵入的), so before planting it, check to make sure it is not a problem in your region.

Hornbeam maple
Native Area: Japan
Height: 15 to 30 feet

Many species of plant within a genus have a similar appearance, but there can be surprises, as is the case with the hornbeam maple. Its leaves are nothing like what you expect from a maple. This can be a somewhat difficult plant to find for sale, but it can make a good   small tree or a large shrub (灌木) in the landscape.

1. What might the name of the first maple be based on?

A．Its height.	B．Its native area.
C．The size of its leaves.	D．The function it performs.

2. Which can adapt to various challenging environments?

A．The bigleaf maple.	B．The hedge maple.
C．The norway maple.	D．The hornbeam maple.

3. What can we learn about the hornbeam maple?

A．Its leaves look like hands.

B．It is larger than other maples.

C．It is easy to find for sale at the market.

D．Its leaves differ from those of typical maples.

5 . Stress often occurs when humans have too much work or are in immediate danger. We communicate our stress to others through our behavior and physiological changes. Thus, stress can communicate information and even be useful for survival in certain situations. On the other hand, the massive spread of stress frequently leads to dangerous situations in groups, such as mass panic.

However, not only humans, but also animals can experience and spread stress. This is the present research focus of Dr Hanja Brand l from the University of Konstanz.

“It has been repeatedly shown that stress can be spread from one human to another,” Brand l says. “Often, a similarly strong physiological response is triggered, even though you have never experienced the stress yourself.” But what is known about stress among animals? Brand l concludes other animals in the group can be just as stressed as the friend who experienced something bad. Stress is evolutionarily deeply rooted and the process is similar in all vertebrates (脊椎动物).

When are animals stressed? To be mentioned primarily are naturally occurring threats to which they are exposed, such as natural enemies. Human influences raise the level of stress. “Increasing changes in the habitat or noise and light pollution also have an impact as these massively influence the environment of the animals.” Brand l explains. “Animals are flexible and can adapt to situations. But at some point, the stress response—the adaptations that otherwise help animals better escape stressors like enemies—no longer gives them a survival advantage,” she adds.

This not only endangers the animals’ health, but also changes the social structure of groups. “If we know how the underlying mechanisms (机制) work, we can better protect animals,” says Brandl.

For humans, too, insights from the animal world are useful, she says. “With humans, we can’t measure the functionality of groups under stress well in natural scenes.” Therefore, Brandl is now continuing her studies. In the future, this will make it easier to respond to and help with the spread of stress in groups of people.

1. What can we learn about stress from paragraph 1?

A．Stress is both good and bad.

B．Group living. can easily cause stress.

C．Each individual reacts differently to stressful situations.

D．Poor communication is one of the biggest causes of stress.

2. What does the underlined word “triggered” probably mean in paragraph 3?

A．Ignored.

B．Eased.

C．Caused.

D．Transformed.

3. What can humans do to help animals reduce stress?

A．Supply food to them.

B．Make them live in groups.

C．Protect their habitat from being destroyed.

D．Provide opportunities for them to practice their survival skills.

4. From which is the text probably taken?

A．A pet magazine.	B．A news website.
C．A book review.	D．A technical forum.

6 . 阅读下面短文，在空白处填入l个适当的单词或括号内单词的正确形式。

A new study suggests Jupiter’s icy moon (卫星) Europa produces much less oxygen than previously thought. The study was based on the data     1     (collect) by NASA’s Juno spacecraft.

The study involved Juno’s instruments measuring levels of oxygen     2     hydrogen molecules (分子) coming from Europa’s atmosphere. The data showed the icy moon produces about 1,000 tons of oxygen every 24 hours. NASA said that would be enough amount     3     (keep) a million humans breathing for a day.

However, the space agency noted those estimates of oxygen were much less than those measured in earlier studies about the moon. Europa is a little     4     (small) than the Earth’s moon. But it is still one of the largest moons in     5     (we) solar system. NASA observations have suggested     6     ocean exists beneath the thick layer of ice on Europa’s surface. Scientists estimate the moon’s ocean may contain a large amount of water,     7     is twice as the Earth’s oceans.

Since Europa was believed to have a large ocean under its surface,     8     (researcher) in the past identified it as a good candidate to hold the right conditions to support some form of life. That data came     9     (main) from telescope observations of oxygen levels existing in the moon’s icy surface. The new lower estimates of oxygen do not support the earlier observations. The team involved in the study said, in the future, more research     10     (need) to confirm the latest findings.

7 . 听下面一段独白，回答以下小题。
1. When did the earthquake take place?

A．On Tuesday.

B．On Wednesday.

C．On Thursday.

2. What happened to the boy in the earthquake?

A．He was badly hurt.

B．He was buried under a refrigerator.

C．He was slightly wounded.

3. How did the boy survive from the big earthquake?

A．He stayed in a refrigerator.

B．His father pulled him out in time.

C．Their house escaped the earthquake.

4. How many people were killed in the earthquake?

A．About 500.

B．About 5, 000.

C．About 50, 000.

8 . One Saturday in June, I got off the train from Vienna at Altenberg station, in the midst of a gathering of bathers, such as often flock to our village at fine weekends.

I had gone only a few steps along the street and the crowd had not yet scattered when, high above me in the air, I saw a bird whose species I could not at first determine. It flew with slow, measured wing-beats, varied at set intervals by longer periods of gliding. It seemed too heavy to be a hawk; for a stork (鹳), it was not big enough and, even at that height, neck and feet should have been visible. Then the bird made a sudden turn so that the setting sun shone for a second full on the underside of the great wings which lit up like stars in the blue of the skies. The bird was white. By Heaven, it was my cockatoo (凤头鹦鹉)! The steady movements of his wings clearly indicated that he was setting out on a long-distance flight.

“What should I do? Should I call to the bird?” Well, have you ever heard the flight-call of the greater cockatoo? No? But you have probably heard pig-killing in the traditional method. Imagine the loudest long cry a pig could make, picked up by a microphone and amplified many times over by a powerful speaker. A man can imitate it quite successfully, though somewhat weak, by shouting at the top of his voice “O-ah”. I had already proved that the cockatoo understood this imitation and promptly “came to heel”. But would it work at such a height? A bird always has great difficulty in making the decision to fly downwards at a steep angle. To yell, or not to yell, that was the question. If I yelled and the bird came down, all would be well, but what if it sailed calmly on through the clouds? How would I then explain my song to the crowd of people?

Finally, I did yell. The people around me stood still, rooted to the spot. The bird hesitated for a moment on outstretched wings, and then, folding them, it descended in one dive and landed upon my outstretched arm. Once again I was master of the situation.

1. What was the author’s cockatoo like?

A．It looked like a hawk.	B．It was blue and shiny.
C．Its neck and feet were long.	D．It was white with great wings.

2. How did the author signal to his cockatoo?

A．By waving at it quickly.	B．By singing a song loudly.
C．By screaming his head off.	D．By using a powerful loudspeaker.

3. What does the underlined part “came to heel” in paragraph 3 mean?

A．Flew about.

B．Came back.

C．Came around.

D．Landed on the ground.

4. Which can be inferred about the author from the text?

A．He knew birds very well.	B．He could speak with his bird.
C．He liked showing off in public.	D．He often surprised people around him.

9 . A songbird jumps around in the woods near Washington, D. C. On its back it carries a very small, lightweight electronic device called a tag (标签). Ecologist Emily Williams watches from behind a bush. On this clear spring day, she says, “Now I’m watching to see whether he’s found a mate.” The bird has moved to a nearby tree where there is another robin. When the bird leaves, this new device it carries will send data about its position to a special satellite, then back to Williams’ computer.

The Georgetown University researchers have been attaching tracking (跟踪) tags on birds and animals for many years. But, the International Space Station and the involved satellite now provide new ways to receive the information sent by the tags. The new system permits scientists to watch songbird movements from a faraway place in much greater detail than before.

“We’re in a sort of golden age for bird research,” said Adriaan Dokter, an ecologist at Cornell University, adding that the technology is improving as the tags are made smaller and smaller. “We can track a robin by satellite with smaller and smaller chips. The device that the robin wears can report its immediate place on Earth, within about 10 meters. Ten years ago, that was unthinkable,” said the scientist, who is not involved in Williams’ study.

A second new device, for only the heaviest robins, provides more information about the bird’s movements; future versions may also measure the humidity and barometric pressure of the space the bird occupies. The devices are known as ICARUS tags.

Martin Wikelski is director of the Max Planck Institute of Animal Behavior. His scientific team is working to improve the ICARUS technology. He hopes that more and better devices could help develop what he called “an Internet of animals”—a collection of sensors around the world giving us a better picture of the movement of life on the planet.

1. What is Emily Williams doing in the woods?

A．Trying to catch a songbird.

B．Observing a bird with a new device.

C．Playing a bird game on the computer.

D．Taking an adventure trip in the nature.

2. How does the electronic device help the researchers?

A．Find the exact place of the robins quickly.

B．Take control of the robins easily.

C．Collect all the information from the satellite.

D．Communicate with the robin in a faraway place.

3. How does the text mainly develop?

A．By explaining the reasons.	B．By making a comparison.
C．By listing two new devices.	D．By analyzing the data.

4. Which is the expectation of Martin Wikelski?

A．People can use more devices to keep healthy.

B．Technology can give better ways to track animals.

C．Human beings and animals can live in harmony.

D．People will know more about animals from the Internet.

10 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

    1     (construct) from the 5th century BC, the Grand Canal was a means of communication for the Empire for the first time in the Sui Dynasty.

Before foundation of Sui Dynasty, China had     2     (continuous) evacuated several canals,     3     had been suspended due to natural environment. Some needed to be repaired but were still navigable, but were too separated from each other to form large-scale water transport nationwide.

The establishment of Sui Dynasty     4     (declare) the end of long-lasting split situation. In 605 AD, Emperor Yang Guang, the     5     (two) emperor of Sui Dynasty, ordered excavation of the Grand Canal to meet the political,     6     (economy) and military needs of unified nation.

The Grand Canal reached a new peak in the Yuan Dynasty (13th century), providing a unified inland navigation network consisting     7     more than 2,000 km of artificial waterways, linking five of the most important river basins in China,     8     (include) the Yellow River and the Yangtze.

As     9     major means of internal communication today, it has played an important role in ensuring the prosperity and     10     (stable) of China over the ages.