1 . The emergence of black holes undoubtedly marks the beginning of a revolution. Black holes have many peculiar properties, such as the alteration of space and time, the radiation of gravitational waves and so on. Scientists are still trying to study the properties and evolution of black holes in order to better understand the origin and evolution of the universe.

Recently, a team of astronomers may have found a solo-wandering black hole using a strange trick of gravity called microlensing (微透镜效应), but the results still have to be confirmed.

Sometimes it’s tough being an astronomer. Nature likes to hide the most interesting things from easy observation. Take, for example, black holes. Except for the strange quantum (量子) phenomenon of Hawking radiation, black holes are completely black. They don’t emit a single bit of radiation – they only absorb, hence their name.

To date, the only way astronomers have been able to spot black holes is through their influence on their environments. For example, if an orbiting star gets a little too close, the black hole can absorb the gas from that star, causing it to heat up as it falls. We can watch as stars dance around the giant black hole at the center of the Milky Way.

Even the famed pictures of the black holes in the center of the Milky Way and the M87 galaxy(星系) aren’t photographs of the black holes themselves. Instead, they are radio images of everything around them.

But surely not all black holes have other light-emitting objects around them to help us find them. To find these wanderers, astronomers have tried their luck with microlensing. We know that heavy objects can bend the path of light around them. This is a prediction of Einstein’s general theory of relativity, and the slight bending of starlight around our own sun was one of the first successful tests of the theory.

Microlensing is pretty much what the name suggests. When astronomers get extremely lucky, a wandering black hole and pass between us and a random distant star. The light from that star bends around the black hole because of its gravity, and from our point of view, the star will appear to temporarily flare in brightness.

And when I say “extremely lucky” I mean it. Despite trying this technique for over a decade, it is only now that astronomers have found a candidate black hole through microlensing. Two teams used the same data, a microlensing event recorded from both the OGLE (Optical Gravitational Lensing Experiment) telescope in Chile and the MOA (Microlensing Observations in Astrophysics) telescope in New Zealand. One team found that the mass was somewhere around seven times the mass of the sun – definitely black hole territory. But the other team estimated a much smaller mass, around 2-4 times the mass of the Sun. If the true mass of the object is at the lower end of that spectrum (光谱), then the wanderer is probably not a black hole.

1. Why does the author say it is hard to be an astronomer?

A．Einstein’s theory is hard to understand.

B．Many things in nature are not easy to observe.

C．Understanding the evolution of the universe is not easy.

D．Whether the black hole has been found remains to be seen.

2. What is the example in Para. 4 trying to prove?

A．Stars’ wandering in black holes.

B．Black holes’ absorbing the star’s gas.

C．The relationship between stars’ heating and black holes.

D．Finding black holes by observing environmental changes.

3. What does the author tell us about the discovery of black holes?

A．People can often find black holes with glowing objects.

B．Research groups can work together to find black holes.

C．Glowing objects around black holes help us find them sometimes.

D．Understanding the properties of black holes helps find them.

4. What conclusion can we draw from the last paragraph?

A．To persevere in the end is to win.

B．Facts speak louder than words.

C．Failure is the mother of success.

D．Things are not always what they seem.

2 .

A．The effects of the flood.	B．The fight against the flood.
C．The cause of the flood.	D．The ten floods of the year.

3 . Rain Collection

What do you like to do on a rainy day —sit inside and listen to the pitter-patter on the roof or splash outside and feel the cold drops on your face? Whatever you choose, rain is vitally essential in the nature.

    1     It fills rivers and lakes, slowly sinks into the earth, nourishes our plants, and keeps the land alive and beautiful. In the past, people obtained their water from rain, wells, or nearby rivers. Now, many of us live in places where water is piped in, sometimes from far away. Removing so much water from nature and sending it to great distances harm the living things that also need that water.

As climate change heats up the planet and causes extreme weather, more places face water shortages.     2     . One easy place to look for more water is the sky!

Humans have collected rain since ancient times.     3    . They are tapping into this clean and rich source of water provided by nature. By harvesting the rain we can reduce the amount of water we take from rivers and out of the ground.

Even in dry climates, there is a lot of potential rainwater that can be effectively harvested and utilized. This rich yet often overlooked resource has the potential to significantly contribute to water conservation efforts, especially in regions facing water shortages. Just one inch of rain falling on a medium-sized house produces over 600 gallons of water.    4    .

Nowadays, rainwater is still used as a primary supply in many places in the world, like Vietnam and Hawaii. In places with piped-in water, rainwater is not commonly used, but this is changing. Rainwater harvesting is getting more popular since it’s easy to do and helps create water security.

A．Large roofs can, hence, collect greater amount of water.

B．Rainwater can also be used for fountains and ponds.

C．We all deeply depend on the nourishment of rain.

D．To secure future water supply, we need new sources.

E．Now, many people are returning to this practice.

F．Rainwater is clean but it gets dirty from the roof.

4 .

A．It will cool down a bit over the weekend.

B．He hopes the weather forecast is accurate.

C．Swimming in a pool has a relieving effect.

D．Summer has become hotter in recent years.

5 . Directions: Fill in each blank with a proper word chosen from the box. Each word can be used only once. Note that there is one word more than you need.

A. conservation       B. relocate       C. momentarily       D. program       E.   critical      F. initiative       G. ensure              H. permanently        I. additional       J. reserve        K. unexpected

A team of scientists led by Alejandro Arteaga, grantee of The Explorers Club Discovery Expeditions and researcher at Khamai Foundation, discovered three new cryptozoic (living underground) snakes dwelling under graveyards (墓地) and churches in remote towns in the Andes region of Ecuador.

It was an exploration that led to the most     1    of places.

First published in the journal, Zookeys, Arteaga and his team named the small brown color-patterned snakes in honor of institutions or people supporting the exploration and    2     of remote cloud forests in the tropics.

The Discovery Ground Snake (Atractus discovery) was found underground in a small graveyard. Two     3    new species were found near an old church and inside a small school. Destruction of the snake’s native forest habitat may have forced them to     4     to these people-less areas according to Arteaga’s findings.

Atractus discovery was named to honor The Explorers Club Discovery Expedition Grants     5    , a program seeking to foster scientific understanding for the betterment of humanity and all life on Earth and beyond. The grant program supports researchers and explorers from around the world in their quest to ease the climate change crisis, prevent the extinction of species and cultures, and    6    the health of the Earth and its inhabitants.

Atractus zgap was named in honor of the Zoological Society for the Conservation of Species and Populations (ZGAP), a(n)     7     seeking to conserve unknown but highly endangered species and their natural environment.

Atractus michaelsabini was named in honor of Michael Sabin, grandson of American philanthropist and conservationist Andrew Sabin. Through conservation organization Re:wild, the Sabin family has supported field research of threatened reptiles and has protected thousands of acres of     8     habitat throughout the world.

“The discovery of these new snakes is only the first step towards a much larger conservation project,” says Arteaga. “We have already started the process of establishing a nature     9     to protect the ground snakes. This action would not have been possible without first unveiling the existence of these unique and cryptic reptiles, even if it meant     10     disturbing the peace of the dead in the graveyard where they lived.”

6 .

From a distance, the grey cement bridge looks unremarkable. Two tunnels on either side of the Trans-Canada Highway are in semi-circles that end bluntly on the pavement below. But on top, away from passing motorists’ eyes, lies a grassy oasis. Against the odds, pine trees and wildflowers have taken root here, giving the overpass a fringe of greenery. On the edges, wire fencing provides safe passage for wandering animals.

Tony Clevenger has dedicated much of his life to studying the performance of Banff’s wildlife crossing structures. When the first wildlife bridges went up, Clevenger, a researcher with the Western Transportation Institute, was living in Canmore, and recalls the distinctly negative atmosphere that surrounded what many saw as a hair-brained scheme by Parks Canada. Save for a few small crossings in the eastern United States, no one had ever attempted something like this before — and no one believed it would work. Editorials in the local paper scoffed at the “waste of taxpayers’ money” and confidently stated animals would never use the $2 million to $3 million man-made bridges. Others believed wolves would herd their prey into the fence, violently killing them before shocked tourists. 

“This project started in a bad spot. There was a lot of opposition and criticism,” Clevenger says. “It took several years of good data, publishing in scientific peer-reviewed journals, to change people’s minds.” 

Clevenger now has 17 years-worth of data proving the efficacy of the crossings. Among large carnivores, mortality (死亡) rates are 50 to 100 per cent lower along sections of the highway where overpasses and underpasses exist. In those same sections, mortality rates for elk are almost zero, compared to 100 elk-vehicle collisions per year in the mid-1990s. Clevenger’s research has shown that 11 species of large mammals in Banff have used the structures more than 200,000 times, including unexpected species such as red fox, hoary marmot, boreal toads, wolverines, lynx, garter snakes and beavers. 

In 2014, a Montana State University study found that not only are grizzly bears using the crossing structures, but the structures are also helping to maintain genetically healthy populations among the bears that use them. Grizzlies were crossing with enough frequency to ensure populations on either side of the highway weren’t genetically isolated from each other. 

“This is Canada’s biggest conservation success story — it’s the largest highway mitigation complex in the world,” says Clevenger. “You won’t find anything anywhere else in the world close to what we have. We have the most overpasses in one localized area and almost half of all the overpasses in North America.”

1. Why did Tony Clevenger face opposition and criticism at the beginning of the wildlife crossing project?

A．Because of disbelief regarding the project’s feasibility and effectiveness.

B．Due to the design flaws of the crossing structures.

C．Because of concerns about the environmental impact of the structures.

D．Due to insufficient funding for the project.

2. Which unexpected species have been observed using the wildlife crossing structures in Banff?

A．Grizzly bears and elk.	B．Wolves and red foxes.
C．Garter snakes and beavers.	D．Hoary marmots and wolverines.

3. How did a Montana State University study contribute to the understanding of wildlife crossings in Banff?

A．It confirmed the disbelief surrounding the effectiveness of the crossings.

B．It identified design flaws in the crossing structures.

C．It criticized the Canadian government’s conservation efforts.

D．It provided evidence of grizzly bears using the crossings and maintaining genetically healthy populations.

7 .

A．The couple has overslept.	B．The flight was overbooked.
C．There was severe weather.	D．A mechanical issue occurred.

8 . A forest in Staffordshire (in the UK) transformed into a hi-tech laboratory. Researchers here are investigating how the trees use carbon, and it’s difficult to find out. In an unusual experiment, extra carbon dioxide is piped to the trees, to create the kind of atmospheric conditions expected in the middle of the century. And instruments measure how the forest reacts.       

The scientist in charge says there’s still a lot to learn. And he worries that governments and companies are rushing to plant trees as an easy answer to climate change. “If you try and use trees to tidy up the mess that we’re making through emissions, you are putting those trees into a very rapidly changing climate and they will struggle to adapt,” said Professor Rob MacKenzie, University of Birmingham.

This device tracks the movement of carbon dioxide. In a healthy forest, the gas is not only absorbed by the trees but some is released as well. What scientists here are finding out is the way carbon flows into a forest and out of it is a lot more complicated than you might think. So, if mass tree planting is meant to be a solution to tackling climate change, the trees are going to have to be monitored and cared for, over not just decades, but may be centuries as well.

Of all the challenges, the task of planting is the simplest. Shelby Barber from Canada can do an amazing 4,000 trees in a day. “People talking about planting millions billions of trees around the world. Is it possible do you think, physically?” asked BBC.

“It’s definitely possible with the right amount of people, the right group of people. I’ve personally, in three years, planted just over half a million trees.” said Professor Rob MacKenzie.

Once planted, the trees need to survive, and experts are mixing different types to minimize the risk of disease. “It’s a bit like making sure you don’t put all your eggs in one basket, you’re spreading out your risk. And then if one part of that woodland fails, for whatever reason, it gets a disease or it can’t tolerate future climatic conditions, there are other parts of the forest that are healthy and able to fill in those gaps.” said Eleanor Tew of Forestry England.

Suddenly there’s momentum to plant trees on a scale never seen before. So what matters is doing it in a way that ensures the forests thrive — so they really do help with climate change.

1. Why is extra carbon dioxide piped to the trees in the experiment?

A．To predict the future atmospheric conditions.

B．To imitate the possible air condition in the future.

C．To create an instrument to measure atmospheric conditions.

D．To investigate the quality of air condition in the future.

2. The underlined word “some” in the second paragraph refers to __________.

A．oxygen

B．carbon dioxide

C．mess

D．purified gas

3. What will Eleanor Tew suggest concerning the survival of the forest?

A．Minimizing the area of the woodland.

B．Studying future climatic conditions.

C．Planting different types of trees.

D．Avoiding mixing different species.

4. Which statement concerning mass tree planting will Professor Rob Mackenzie mostly likely agree with?

A．It should be advocated in terms of efficiency and convenience.

B．It is the most effective solution to fighting climate changes.

C．It will do more harm than good to the health of the environment.

D．It needs to be studied further as a measure against climate change.

9 . The Fight against Fast Furniture

Fast furniture is a term that refers to furniture that is produced cheaply and quickly. These items are often bad for the environment because they are made from materials that break easily and need to be replaced often.     1    

To help protect the environment, a movement to move away from fast furniture has begun. Many companies are joining the fight by finding cleaner ways to manufacture furniture. For example, IKEA has agreed to switch to using renewable or recycled materials for their furniture by the year 2030.     2    

There is also a push to encourage shoppers to buy more used furniture for their homes. Small businesses that help transform old chairs and sofas into completely new products have even popped up recently. At the end of the day, consumers will play the most important role in the fight to end fast furniture. Shoppers should try to think more about the long term when preparing to purchase new furniture. They should stay away from furniture that is made from cheap materials like fiberboard or plastic because they will often fall apart after a few years.     3    

A much better alternative is furniture made from real wood because it won’t break as easily. If wood furniture is damaged, it can often be repaired to last longer. High-quality metals are another good material, as they are durable. If the furniture is no longer fit for use, these metals can still be recycled and used to make new products.

    4     So, the next time you buy furniture, think about whether it’s something that will last a long time or it’s just fast furniture that will break soon and go into the trash.

A．It has also designed a special program that lets people return used furniture pieces to its stores so they can be fixed and used again by consumers.

B．This would help to reduce overall waste, as it would extend the life cycle of old furniture items.

C．Although these items may cost less initially, they are more expensive because they will need to be replaced sooner than traditional pieces of furniture.

D．This creates a lot of pollution, as the furniture ends up buried in landfills where it can harm the soil.

E．Homeowners are looking for furniture that is kinder to the environment.

F．By choosing furniture that’s made to last, we can help reduce waste and protect the environment.

10 . THE GLOBAL WASTE TRADE IS ESSENTIALLY BROKEN

Cut into hillside in northern Malaysia stands a large, open-air warehouse. This is a recycling factory, which opened last November. On a very hot afternoon in January, Shahid Ali was working his very first week on the job. He stood knee-deep in soggy, white bits of plastic. Around him, more bits floated of the conveyor belt and fell to the ground like snowflakes.

Hour after hour, Ali sorts through the plastic jumble moving down the belt, picking out pieces that look off-color or soiled-rejects (废品) in the recycling process. Though it looks like backbreaking work, Ali says it is a great improvement over his previous job, folding bed-sheets in a nearby textile factory, for much lower pay. Now, if he eats simply, he can save money from his wages of just over $l an hour and send $250 a month to his parents and six brothers and sisters in Peshawar, Pakistan, 2,700 miles away, “As soon as I heard about this work, I asked for a job,” says Ali, 24, a bearded man with glasses and an easy smile. Still, he’s working 12 hours a day, seven days a week. “If I take a day off, I lose a day’s wages,” he says.

In the warehouse, hundreds of bags are stacked more than 60 feet high-each stuffed with plastic wrappers and bags thrown away weeks earlier by their original users in California. The fact that the waste has traveled to this distant corner of the planet in the first place shows how badly the global recycling economy has failed to keep pace with humanity’s plastics addiction. This is an ecosystem that is deeply dysfunctional, if not on the point of collapse: About 90% of the millions of tons of plastic the world produces every year will eventually end up not recycled, but burned, buried, or dumped.

Plastic recycling enjoys ever-wider support among consumers: Putting yogurt containers and juice bottles in a blue bin is an eco-friendly act of faith in millions of households. But faith goes only so far. The tidal wave of plastic items that enters the recycling stream each year is increasingly likely to fall right back out again, casualties of a broken market. Many products that consumers believe (and industries claim) are “recyclable" are in reality not, because of hard economics. With oil and gas prices near 20-year lows, so-called virgin plastic, a product of petroleum feed-stocks, is now far cheaper and easier to obtain than recycled material. That unforeseen shift has yanked the financial rug out from under what was until recently a practical recycling industry. “The global waste trade is essentially broken,” says the head of the global plastics campaign at Greenpeace. “We are sitting on vast amounts of plastic with nowhere to send it and nothing to do with it.”

1. What is the author’s attitude towards Shahid Ali?

A．Critical.

B．Merciless.

C．Indifferent.

D．Sympathetic.

2. What most probably causes the problem of global waste recycling?

A．The prices of oil and gas have been increasing.

B．Tons of wastes travel so far before being recycled.

C．Recyclable products are not really recycled.

D．Governments don’t support the recycling industry.

3. What does the italicized word “dysfunctional” mean in the passage?

A．Out of stock.

B．Far from pleased.

C．Full of energy.

D．Out of order.

4. What is the author’s purpose of writing this article?

A．To illustrate how plastic waste has been recycled in the world.

B．To warn people that the global waste trade is essentially broken.

C．To analyze the relationship between consumers and factories.

D．To solve the conflict between the recycling industry and governments.