1 . After five long years, it appears California’s drought is finally becoming less severe. _______ a recent string of storms, more than a third of the state has now welcomed healthy precipitation (降水量), and California’s snowpack—a(n) _______ source of water as the year progresses—has reached nearly twice its seasonal average in some parts of the Sierra Nevada. That’s a dramatic improvement over last summer, when literally every inch of the state _______ drought conditions. It’s also welcome news for Californians, who have faced a series of water _______ since Governor Jerry Brown declared a state of emergency in early 2014. Farmers have been forced to spend heavily to maintain production.

The state’s water struggles, _______, are far from over. For one, nobody knows for sure how long these rains will last. Although recent precipitation has been _______—in some places more than 80 inches—the accuracy of storm forecasting remains _______ beyond a week. Californians know this all too well: last year, experts projected a “Godzilla” El Niño that would bring record levels of precipitation. It never _______. “Will six weeks from now be wet?” asks Jeanine Jones, California’s interstate water-resources manager. “The skill in that kind of forecasting is just not there.”

_______, a storm slowdown is a very real possibility—and it could leave California without enough water to make it through the dry summer. ________, when that happens, the state has turned to groundwater stored in natural rock formations deep beneath the earth’s surface. But those ________ remain used up after years of drought; restoring them could take years in some places, says Jones.

The quick inrush of water has also created a(n) ________ balancing act for water managers. Keeping surface reservoirs (水库) filled to the edge protects against the possibility of a sudden dry spell, but it also

________ the risk of flooding if and when future storms hit. To that end, water managers opened the Sacramento Weir floodgates earlier this month to pour reservoir water into nearby fields after ________ showed local water levels would likely continue to rise. That’s a calculation that will be made across the state in the coming months.

For now, though, Jones is focused on planning and ensuring the state’s water supply whatever may happen. “We’re halfway through our wettest season, and conditions have been encouraging,” she says. “I would say we’re ________ optimistic.”

1.

A．According to

B．With respect to

C．Thanks to

D．In addition to

2.

A．official

B．exhaustible

C．unexpected

D．crucial

3.

A．experienced

B．improved

C．worsened

D．investigated

4.

A．pollution

B．restrictions

C．pressure

D．cycles

5.

A．nevertheless

B．therefore

C．meanwhile

D．moreover

6.

A．accurate

B．plentiful

C．consistent

D．emergent

7.

A．productive

B．unchangeable

C．progressive

D．unreliable

8.

A．fell behind

B．broke down

C．came about

D．took off

9.

A．Or else

B．In other words

C．At that point

D．Above all

10.

A．Literally

B．Contrarily

C．Historically

D．Consequently

11.

A．levels

B．formations

C．struggles

D．reserves

12.

A．random

B．delicate

C．mechanical

D．insensible

13.

A．heightens

B．assumes

C．minimizes

D．identifies

14.

A．restorations

B．calculations

C．conditions

D．projections

15.

A．hopelessly

B．extremely

C．guardedly

D．cheerfully

2 . Sea levels along coastlines in the United States will rise about one foot by 2050, with larger increases on the East and Gulf coasts, according to a comprehensive new report by climate scientists.

Oceans have already risen about one foot in the last century, as climate change melts glaciers (冰川) and ice caps around the world. But the pace is ______ scientists warn, and the next 30 years will see the same amount of sea level rise as the previous 100.

The report gives the most concrete and certain sea level ______ ever published for the U.S. And advances in computer models and real-world information about rising seas make it possible to see the future more ______ than ever.

Sea level rise ______ dramatically for different parts of the U.S. coast. The ocean is not like a bucket of water that rises at the same time as more liquid is ______. Ocean ______ push more water into some areas than others. Ice in different regions melts at different rates. In many parts of the world, sea level rise is ______ because coastal land is sinking.

The new report adds up all those factors to give ______ estimates for different parts of the U.S. The authors predict about a foot and a half of sea level rise for the Gulf Coast by 2050, with particular hot spots from Texas to Mississippi, where exploitation of underground oil, gas and drinking water is causing the land to rapidly _____ into the rising ocean water. There are ______ hot spots in the Mid-Atlantic region, including Annapolis, Md. and Norfolk, Va. Overall, the East Coast is ______ to experience a little more than a foot of sea level rise in the next 30 years.

Sea level rise is happening more ______ on the West Coast, including much of southern and western Alaska, the report finds. The authors predict about six inches of sea level rise by 2050.

William Sweet, a sea level rise expert with the National Oceanic and Atmospheric Administration (NOAA) and one of the authors of the new report, says cities that are not yet flooded should ______ now. Quickening sea level rise may require that humans ______ where and how we build homes, offices, roads and anything else that is better dry than wet. Right now, development in flood-prone (易发洪水的) areas is increasing, despite climate change.

Beyond 2050, the report makes clear that humans have a ______: reduce greenhouse gas emissions and control sea level rise, or keep burning fossil fuels and face oceans that are two, three or even 10 feet higher than today.

1.

A．dying down

B．paying back

C．holding on

D．speeding up

2.

A．records

B．extremes

C．predictions

D．solutions

3.

A．flexibly

B．clearly

C．randomly

D．incredibly

4.

A．continues

B．impacts

C．multiplies

D．varies

5.

A．added

B．drained

C．spilt

D．needed

6.

A．creatures

B．currents

C．ecosystems

D．voyages

7.

A．stable

B．crucial

C．unlikely

D．worse

8.

A．national

B．regional

C．apparent

D．approximate

9.

A．dig

B．turn

C．collapse

D．dive

10.

A．similar

B．scenery

C．distant

D．diverse

11.

A．projected

B．obliged

C．permitted

D．noticed

12.

A．sharply

B．mysteriously

C．unexpectedly

D．slowly

13.

A．make sense

B．take notice

C．keep pace

D．stay proud

14.

A．scheme

B．cancel

C．change

D．delay

15.

A．promise

B．quarrel

C．choice

D．protest

3 . Last week came solid evidence that living in toxic Britain can seriously harm your health. Cardiologists at Queen Mary University of London found that even "safe" levels of air pollution are linked to heart abnormalities similar to those seen during the early stages of heart failure. Their study of almost 4,000 people was backed up by a major US study which showed that higher exposure to fine particles and nitrogen oxides is linked to an acceleration in the hardening of the arteries (动脉).

We have long known that air pollution leads to coughing, shortness of breath and irritation in the eyes, nose and throat. It is also clearly linked to respiratory diseases such as asthma and bronchitis, as well as diabetes and some cancers. It is now beyond doubt that children's health is greatly affected, and links have been made between it and Parkinson's, Alzheimer's, dementia and congenital birth defects.

The statistics are alarming. In the UK, more than 2 million people suffer from cardiovascular (心血管的) diseases, and nearly one in seven men and one in 12 women will go on to die from them. Heart disease costs the UK economy nearly £30 bn a year to treat, as much as the state spends on secondary education. It is one of the greatest single drains on the public purse. Britain, however, rejects common sense, and shows little sign that it wants to seriously address pollution any time soon.

Despite the mounting evidence of air pollution's costs and health impact, Britain has had to be dragged screaming through the courts to make it comply with minimal clean air guidelines and laws. Successive governments have continually tried to evade their legal responsibilities, spending millions of pounds fighting in the courts and lobbying the EU to be allowed to continue to pollute.

The government now has a new draft clean air strategy our for consultation until 14 August and claims to be acting faster to tackle air pollution than almost every other major developed economy. It pledges to halve the number of people living in places that do not meet World Health Organization pollution guidelines, and it propose to end the sale of new diesel and petrol cars and vans by 2040.

But intending to cut the air pollution bill by around 12.5% in 12 years and waiting 20 years to be rid of the worst vehicles seems criminally weak. Meanwhile, government is knowingly forging ahead with infrastructure plans that will inevitably increase air pollution. The effect will inevitably be to massively increase air pollution and health costs for millions of Britons.

So could the car-clogged streets of Sunder-land, Birmingham and London, where I lived for many years, have contributed to my disease and those of millions of others? Probably. Could the oil companies be responsible for far more than climate change? Certainly. Could Britain's monstrous and mounting bill for heart disease be partly due to the highly polluting diesel cars that governments so scandalously encouraged us to drive? Quite possibly.

What is certain is that air pollution is now an international scandal, and the cause of a health emergency that governments and industry have failed to address. It undoubtedly threatens life more than any war or disaster. When there are clear alternatives to burning fossil fuels then politicians who do not act to prevent it must stand accused not just of failing to act, but of condoning the mass poisoning of their people.

1. According to the study, ________ is probably unrelated to air pollution.

A．diabetes

B．stomachaches

C．Alzheimer

D．artery hardening

2. The writer thinks Britain shows little sign to tackle air pollution because ________.

A．British government has been screaming for help in court

B．EU has dissuaded British government for help in court

C．British government has tried to have EU's permission for more pollution

D．The government firmly refused to act in accordance with the clean air guideline.

3. What is the writer's attitude toward the new draft?

A．Britain will implement it faster than other major developed economies.

B．It presents a practical way to end pollution from vehicles.

C．Its goal will be achieved at the price of massive health cost.

D．It's aiming too low when more pollution is expected.

4. What can be inferred from the article?

A．Government officials should feel disgraced for non-action as leaders.

B．The government should cover the bills for air pollution and related diseases.

C．Oil companies should not be held accountable for the international scandal.

D．British government is an irresponsible one for encouraging people to use vehicles.

4 . The cultivation of plants by ants is more widespread than previously realized, and has evolved on at least 15 separate occasions.

There are more than 200 species of ant in the Americas that farm fungi (真菌) for food, but this trait evolved just once sometime between 45 million and 65 million years ago. Biologists regard the cultivation of fungi by ants as true agriculture appearing earlier than human agriculture because it meets four criteria: the ants plant the fungus, care for it, harvest it and depend on it for food.

By contrast, while thousands of ant species are known to have a wide variety of interdependent relationships with plants, none were regarded as true agriculture. But in 2016, Guillaume Chomicki and Susanne Renner at the University of Munich, Germany, discovered that an ant in Fungi cultivates several plants in a way that meets the four criteria for true agriculture.

The ants collect the seeds of the plants and place them in cracks in the bark of trees. As the plants grow, they form hollow structures called domain that the ants nest in. The ants defecate (排便) at designated absorptive places in these domain, providing nutrients for the plant. In return, as well as shelter, the plant provides food in the form of fruit juice.

This discovery prompted Chomicki and others to review the literature on ant-plant relationships to see if there are other examples of plant cultivation that have been overlooked. “They have never really been looked at in the framework of agriculture,” says Chomicki, who is now at the University of Sheffield in the UK. “It’s definitely widespread.”

The team identified 37 examples of tree-living ants that cultivate plants that grow on trees, known as epiphytes (附生植物). By looking at the family trees of the ant species, the team was able to determine on how many occasions plant cultivation evolved and roughly when. Fifteen is a conservative estimate, says Campbell. All the systems evolved relatively recently, around 1million to 3 million years ago, she says.

Whether the 37 examples of plant cultivation identified by the team count as true agriculture depends on the definitions used. Not all of the species get food from the plants, but they do rely on them for shelter, which is crucial for ants living in trees, says Campbell. So the team thinks the definition of true agriculture should include shelter as well as food.

1. According to biologists, why is ant-fungus cultivation considered as a form of true agriculture?

A．Because it occurred earlier than human agriculture.

B．Because it fulfills the standards typical of agricultural practices.

C．Because it redefines the four criteria for true human agriculture.

D．Because it is less common than previously thought.

2. What motivated Chomicki and others to review the literature on ant-plant relationships?

A．They determined on new family trees of the ant species.

B．They overlooked some tree-living ants that provided nutrients for the plants.

C．They never studied the ant-plant relationships within the context of agriculture.

D．They never identified any an t species that engaged in cultivation of fungi.

3. Which of the following statements is supported by the team's findings according to the passage?

A．Ants’ cultivation of plants is limited to a few specific species.

B．The cultivation of fungi by ants is considered the earliest form of agriculture.

C．True agriculture in ants involves only food-related interactions with plants.

D．Ants have independently cultivated plants on at least 15 distinct occasions.

4. What is the passage mainly about?

A．The evolution of ants in the plant kingdom.

B．The widespread occurrence of ant-plant cultivation.

C．The discovery of a new ant species engaging in agriculture.

D．The contrast between ant agriculture and human agriculture.

5 . Many people learn at an early age to associate the color red with danger. So might it make sense to print medication   ________ in red ink? And since the color blue is known to call to mind the freedom of open skies, might it help artists to   ________ in a studio painted in that color? According to new research into how the brain reacts to ________ , the answer to both of these questions is yes. The study revealed that the color red seems to improve a subject’s attention to ________ , while blue appears to stimulate creativity—all without the subject realizing that his or her brain is being influenced.

“People are not ________ this effect at all,” marveled the study’s lead researcher Juliet Zhu, who studies the effects of environmental cues on behavior. To study the brain’s response to specific colors, Zhu’s team administered a series of   ________ tests to college students. For most of the tests, the students were placed in front of a computer screen that was colored either red or blue.

The researchers found that when the screen was red, subjects performed better on detail-oriented tasks. In one test,   ________ , students were asked to memorize a list of words. Zhu found that students who studied the list displayed on a red screen were able to recall more words than students who studied the list on a ________ screen.

In other tests, creative abilities seemed to be ________ by looking at the color blue. For instance, the students were asked to brainstorm potential uses for bricks. Students sitting in front of blue screens tended to come up with ideas that were   ________ , such as “make a paperweight” and “build a pet scratching post.” Students sitting in front of a red screen, on the other hand, were more likely to list ________ uses for bricks, such as “build a house.”

Researchers concluded from the tests that seeing red causes people to take the extra time to think ________ when performing detail-oriented tasks, such as ________ , proofreading— and, of course, reading those all-important warning labels. ________ most people learn early in their development that red signifies potential danger, Zhu said, seeing red perhaps helps people to slow down in order to perform at their best in a potentially risky situation. Seeing blue, on the other hand, produces images of the sky, freedom and peace. Perhaps these images, researchers supposed, ________ feelings. “It’s really this learned association with these colors that drives these different motivations,” Zhu said.

1.

A．instructions

B．symptoms

C．warnings

D．treatments

2.

A．create

B．relax

C．decorate

D．design

3.

A．skies

B．medication

C．colors

D．paint

4.

A．danger

B．detail

C．emotions

D．vigor

5.

A．distracted by

B．aware of

C．content with

D．curious about

6.

A．cognitive

B．intelligence

C．mental

D．memory

7.

A．on one hand

B．at the same time

C．for example

D．that is

8.

A．grey

B．blue

C．green

D．white

9.

A．proven

B．acquired

C．recognized

D．enhanced

10.

A．more abstract

B．more positive

C．more innovative

D．more valuable

11.

A．practical

B．academic

C．economical

D．profitable

12.

A．critically

B．logically

C．carefully

D．independently

13.

A．painting

B．memorizing

C．designing

D．brainstorming

14.

A．Unless

B．When

C．Since

D．Though

15.

A．turn up

B．stir up

C．set off

D．give off

6 . The world is wasting the opportunity to “build back better” from the Covid-19 pandemic, and faces disastrous temperature rises of at least 2.7°C if countries fail to strengthen their climate commitments, according to a report from the UN.

Tuesday’s publication warns that countries’ current commitments would reduce carbon by only about 7.5% by 2030, far less than the 45% cut, which scientists say is needed to limit global temperature rises to 1.5℃, the aim of the Cop26summit that opens in Glasgow this Sunday.

António Guterres, the UN secretary-general, described the findings as a “thundering wake-up call“ to world leaders. while experts called for action against fossil fuel companies.

Although more than 100 countries have promised to reach net zero emissions around mid-century, this would not be enough to avoid climate disasters, according to the UN emissions report, which examines the shortfall between countries’ intentions and actions needed on the climate. Many of the net zero commitments were found to be unclear, and unless accompanied by strict cuts in emissions this decade would allow global heating of a potentially disastrous extent.

Guterres said: “The heat is on, and as the contents of the report show, the leadership we need is off. Far off. Countries are wasting a massive opportunity to invest Covid-19 finance and recovery resources in sustainable, cost-saving, planet-saving ways. As world leaders prepare for Cop26, this report is another thundering wake-up call. How many do we need?”

Inger Andersen, the director of the UN Environment Programme (UNEP) said: “Climate change is no longer a future problem. It is a now problem. To stand a chance of limiting global warming to 1.5℃, we have 8 years to almost halve greenhouse gas emissions: 8 years to make the plans, put in place the policies, carry them out and deliver the cuts.The clock is ticking loudly.”

Emissions fell by about 5.4% last year during Covid lockdowns, the report found, but only about one-fifth of the economic recovery spending goes towards reducing carbon emissions. This failure to ”build back better“ despite promises by governments around the world cast doubt on the world’s willingness to make the economic shift necessary to settle the climate crisis, the UN said.

In the run-up to Cop26, countries were supposed to submit national plans to cut emissions - called nationally determined contributions (NDCs) - for the next decade, a requirement under the 2015 Paris climate agreement. But the UNEP report found only half of countries had submitted new NDCs, and some governments had presented weak plans.

1. Why were the findings described as a “thundering wake-up call” in Para. 3?

A．Because the world has failed to deliver on its current promises.

B．Because the serious problems were brought about by global fossil fuels.

C．Because a global temperature rise of at least 2.7°C would be a disaster.

D．Because the opportunities presented by covid-19 have been wasted.

2. According to the author, in what circumstances is global warming avoidable?

A．New plans will be made to protect the environment.

B．Measures will be taken to reduce emissions in the coming ten years.

C．Transitions will be made in response to the global climate crisis.

D．Global sustainable environmental resources will be greatly developed.

3. What is the author’s purpose in saying “How many do we need?” in Para.5?

A．To show the number of alarm clocks required.

B．To inquire the number of the countries attending the meeting.

C．To explain the reason for the world’s wasting chances.

D．To stress the need to save energy and reduce emissions.

4. What can be inferred from the last paragraph?

A．Few countries have submitted plans to reduce the emissions.

B．Most of the countries work under the Paris Climate Agreement.

C．Plans to cut emissions of many countries are far from satisfactory.

D．Much progress in reducing emissions has been made these years.

7 . Why Do Cats Love Boxes So Much?

There is an object that’s pretty much guaranteed to arouse your cat’s interest. That object, as the Internet has so thoroughly documented, is a box. Any box, really. Like many other really strange things cats do, science hasn’t fully cracked this particular feline (猫科的) mystery.

    1     In fact, when you look at all the evidence together, it could be that your cat may not just like boxes, he may need them.

The box-and-whisker plot

Understanding the feline mind is extremely difficult. Still, there’s a sizable amount of behavioral research on cats who are, well, used for other kinds of research. These studies have been taking place for more than 50 years and they make one thing quite clear:     2    

This is likely true for a number of reasons, but for cats in stressful situations, a box or some other type of separate enclosure can have a strong impact on both their behavior and physiology.

Ethologist Claudia Vinke of Utrecht University in the Netherlands is one of the latest researchers to study stress levels in shelter cats. Working with domestic cats in a Dutch animal shelter, Vinke provided hiding boxes for a group of newly arrived cats while keeping another group from them entirely.     3     In effect, the cats with boxes got used to their new surroundings faster, were far less stressed early on, and were more interested in interacting with humans.

The ‘If it fits, I sits’ principle

Some feline observers will note that in addition to boxes, many cats seem to pick other odd places to relax. Some curl up in a bathroom sink.     4     This brings us to the other reason why your cat may like particularly small boxes: It’s really cold out.

So there you have it: Boxes are insulating, stress-relieving, comfort zones—places where cats can hide, relax, sleep, and occasionally launch a surprise attack against the huge, unpredictable apes they live with.

A．Your furry companion obtains comfort and security from enclosed spaces.

B．Others prefer shoes, bowls, shopping bags, coffee mugs, empty egg cartons, and other small, enclosed spaces.

C．She found a significant difference in stress levels between cats that had the boxes and those that didn’t.

D．A box, in this sense, can often represent a safe zone, a place where sources of anxiety, hostility (恶意), and unwanted attention simply disappear.

E．So rather than work things out, cats tend to simply run away from their problems or avoid them altogether.

F．Thankfully, behavioral biologists and veterinarians have come up with a few interesting explanations.

8 . AI-based Conservation Efforts

When an endangered seabird hits a power line, it makes a sound “very much like the laser sound from Star Wars,” says conservation (野生动物保护) biologist Marc Travers. He should _________ as his team from the Endangered Seabird Recovery Project recorded thousands of hours of audio to determine if power lines affected local seabirds. Travers was trying to help establish how _________ birds were killed by power lines on the island of Kauai in Hawaii in 2011.

His team recorded 600 hours of audio and sent the recordings to Conservation Metrics, a company that assists conservation efforts with AI resources. Conservation Metrics used a program to “listen” to the recordings and _________ the sounds that signified bird electrocutions (触电身亡) . The result was _________, as the number of bird electrocutions was in the thousands. Armed with _________ that power lines were killing a significant number of birds, the team worked with the local utility service to reduce bird deaths.

_________, humans have been poor guardians of the planet. Humans have altered as much as 97 percent of land ecosystems. Key populations of _________ animals have dropped as much as 68 percent since 1970. The _________ in biodiversity around the world has created a depressing situation. Conservation efforts _________ key resources they need to have real impacts.

__________, humans now have AI-based tools that can help. AI can quickly and accurately __________ large amounts of data created by observations in the field. Then other programs such as PAWS (Protection Assistant for Wildlife Security) can help analyze the data and suggest the most __________ ways to focus conservation efforts.

In large national parks and wildlife reserves, poachers (偷猎者) are a danger for animals both big and small. Some animals are worth a lot of money on the black market. Park guards are left with an impossible task because there is too much land to __________. But the PAWS program allows guards to focus their efforts. PAWS has even predicted the __________ of traps in areas not yet patrolled (巡逻) by rangers!

We still face many challenges to __________ the loss of wildlife, but AI-powered programs promise to be a powerful conservation tool.

1.

A．assume

B．know

C．hope

D．lead

2.

A．frequently

B．directly

C．violently

D．rarely

3.

A．imitate

B．locate

C．count

D．present

4.

A．puzzling

B．demanding

C．disturbing

D．uplifting

5.

A．justice

B．proof

C．image

D．wisdom

6.

A．In theory

B．By definition

C．On the contrary

D．By many measures

7.

A．monitored

B．enclosed

C．requested

D．overlooked

8.

A．decline

B．expansion

C．climb

D．quality

9.

A．supply

B．renew

C．lack

D．invent

10.

A．Obviously

B．Fortunately

C．Interestingly

D．Initially

11.

A．give away

B．sort through

C．get over

D．make up

12.

A．exclusive

B．delicate

C．effective

D．special

13.

A．convey

B．mark

C．cover

D．hide

14.

A．emergence

B．movement

C．evolution

D．existence

15.

A．recover

B．reverse

C．remove

D．reveal

9 . In 2004, Pen Hadow became the first person to trek (跋涉) to the North Pole alone, without being resupplied on the way. That meant swimming through unimaginably cold waters, and risking encounters with polar bears. Just eight months later, he made a similar trip to the South Pole. Now he is back in the Arctic again, preparing for an expedition (远征) he says is even more ambitious. Explorers are confident, driven individuals. They have to be. This time, however, more significance is attached. Pen and two colleagues will set out on a three-month, 1000-kilometre trek to the North Pole, taking detailed measurements of the thickness and density of the ice. Nobody has ever done this before, and he knows the results will be of vital significance to the scientific community. This will be the truest picture yet of what global warming is doing to the ice that covers the polar region.

Pen and his wife, Mary, live in the country with their two children. “It’s much harder to be away from them this time,” he admits. They were one and five when I last went, and I made a mistake in the way I said goodbye. I thought it would be a good idea to say to my son, “You’re the man of the house now, look after your mum and your sister.” He absolutely took it to heart, asking his mum how she was all the time, but the stress eventually became too much. While it was well intentioned, it was an unfair thing to do.

He is spending these last days before departure preparing his things. “Out on the ice, one is virtually unable to mend things or do anything that isn’t absolutely straightforward,” he says. With him will be Ann Daniels, one of the world’s leading polar explorers, and the photographer, Martin Hartley. They will be supported by a crew of six, flying in supplies. Being part of a team is actually more stressful to someone with his mentality, says Pen, and something else is on his mind too. “I’m going to be 47 on Thursday. I’ve done far less training than I’m comfortable with.” Why? “Organisational things always seem more urgent. So I’m almost fearful of what I’m going to ask of myself.”

Pen believes his mission reconnects exploration with the search for knowledge that drove previous generations into the unknown. “Making it to the North Pole was a personal ambition,’”he admits, “and of limited value to anyone beyond the polar adventuring community. This time, scientists will profit from the data, and we’re creating a platform in which to engage as many people as possible in what’s happening in the Arctic Ocean. This is important work, and nobody can do it but us,” he says. “Our skills, which are otherwise not that necessary, have become really relevant. Suddenly, we’re socially useful again.”

1. In the first paragraph, what do we learn about Pen Hadow’s opinion of the new expedition?

A．He feels certain that it will be stressful.

B．He is aware of the huge importance of its aims.

C．He thinks it may be harder than his previous journeys.

D．He is less than confident of the scientific work it involves.

2. What does “took it to heart” (in paragraph 2) mean?

A．He started to feel unwell.	B．He memorised his father’s words.
C．He was afraid of the responsibility.	D．He carried out his father’s words carefully.

3. What is worrying Pen about the new expedition?

A．Whether he will be mentally prepared

B．Whether he will still be fit enough to take part.

C．Whether the arrangements he has made will turn out well.

D．Whether the equipment will work properly in icy conditions.

4. When he compares the new expedition to his previous ones, Pen feels ________.

A．uncertain if it will collect information.

B．doubtful about its long-term usefulness

C．pleased that more people will benefit from it

D．relieved that the general public will be more supportive

10 . With billions of stars in our galaxy (银河系), many circled by planets, the chances are there should be advanced life capable of reaching out to us. Yet after decades of looking and listening, we have found ___________.

This apparent conflict is known as Fermi’s paradox- Some have used it to argue that the search for extraterrestrial(外星球的)intelligence (SETI) is sure to ___________ .

But a mathematical analysis of SETI searches done so far claims that the usual explanation for the paradox— that there is nobody out there—is ___________. Instead, it suggests the best explanation is simply that we have barely scratched the surface in our ___________ for extraterrestrial intelligence.

Jason Wright at Pennsylvania State University and his colleagues analysed the many variables involved in SETI, which involves searching for radio signals from other ___________ . These include what to look for, where to look, how often and for how long. They then devised an equation that computes the ___________ of the galaxy checked so far. The team says that the volume of the galaxy that has been checked by SETI so far is roughly___________ to just a single bathtub of water in the world’s oceans.

“You don’t have to do a calculation to say we’ve only just ___________ ,” says Duncan Forgan at the University of St Andrews, UK, who is a member of the UK SETI research network. ”But they’ve done a nice job of showing the huge scale of the problem___________.“

As well as putting SETI in context, the equation can help researchers see which search techniques have been used less than others. ____________ , we only developed the technology to listen for higher radio frequencies quite recently. ”But we’re getting better at that, so that variable will now shrink,“ says Forgan.

However, advances in ____________ will only take us so far. Certain variables, such as how often a message from space might be repeated, cannot be____________. A signal sent once a year can only be listened out for once a year. ”There are things we can do better and things we can’t,” says Forgan. “We just have to ____________ and wait for the universe to do its thing.”

Forgan has a book coming out that discusses 66 potential ____________ for Fermi’s paradox. They include the possibility that Earth is somehow unusual in its ability to harbour intelligent life or that technological civilisations are rare. Or perhaps they are ____________ but short-lived. “Genetic or nuclear disasters might wipe you out,” says Forgan.

1.

A．nothing

B．something

C．anything

D．everything

2.

A．arrive

B．join

C．fail

D．improve

3.

A．possible

B．simple

C．relative

D．false

4.

A．hunt

B．love

C．service

D．region

5.

A．individuals

B．civilisations

C．surroundings

D．organisations

6.

A．source

B．centre

C．edge

D．part

7.

A．subject

B．equivalent

C．available

D．committed

8.

A．remembered

B．mentioned

C．described

D．started

9.

A．progressively

B．mathematically

C．synthetically

D．occasionally

10.

A．For example

B．What’s more

C．In summary

D．By comparison

11.

A．technology

B．computation

C．radioactivity

D．astronomy

12.

A．measured

B．challenged

C．changed

D．interpreted

13.

A．set off

B．sit back

C．put up

D．take down

14.

A．demands

B．benefits

C．explanations

D．applications

15.

A．weird

B．boring

C．exciting

D．common