A tiny clue found in ancient deposits has unlocked big secrets about Greenland’s past and future climate. Just beyond the northwest edge of the vast Greenland Ice Sheet, researchers have discovered lake mud that have survived the last ice age. The mud, and remains of common flies in it, record two interglacial periods（间冰期）in northwest Greenland.
Although researchers have long known these two periods—the early Holocene and Last Interglacial—experienced warming in the Arctic, the mix of fly species shows that Greenland was even warmer than previously thought. “As far as we know, it has never been found in Greenland. We think this is the first time anyone has reported it in ancient deposits or modern lakes there,” Axford said. “We were really surprised to see how far north it migrated (迁徙).”
This new information could help researchers better measure Greenland’s sensitivity to warming, by testing and improving models of climate and ice sheet behaviour. Those models could then improve predictions of how Greenland’s ice sheet might respond to man-made global warming. After all, Greenland covers 80 per cent of the Arctic country and holds enough ice to equal 20 feet of global sea level. “Northwest Greenland might feel really remote, but what happens to that ice sheet is going to matter to everyone in every coastal city around the world,” said Yarrow Axford, an associate professor in the team. “One of the big uncertainties in climate science is how fast the Earth changes when it gets warmer. Geology gives us an opportunity to see what happened when the Earth was warmer than today,” said Axford.
People might be surprised to see how today’s Greenland looked during the last two interglacial periods. During the Last Interglacial, global sea levels increased by 15 to 30 feet, largely due to thinning of Greenland and Antarctica’s ice sheets. However, now researchers believe northern Greenland’s ice sheet experienced stronger warming than previously thought, which could mean that Greenland is more responsible for that sea-level rise.
Finding lake deposits older than about 10,000 years, however, has been historically very difficult in Greenland. To measure these ancient temperatures, researchers look to ice cores ( 冰 核 ) and lake deposits. Since ice and lake deposits form by a gradual buildup on annual layers of snow or mud, these cores contain history of the past. By looking through the layers, researchers can obtain climate clues from centuries ago.
1.Why are the remains of flies mentioned in the first two paragraphs?
A.They serve as evidence that there is still life in the Northwest Greenland.
B.They were one of the many ancient lives that were left in the Greenland mud.
C.They are indicators that Greenland was much warmer than previously thought.
D.They help the researchers realize that there was once a warm period in the Arctic.
2.Which of the following can be inferred from the passage?
A.It is easier for today’s scientists to find ancient lake deposits.
B.People are surprised at the landscape feature of Greenland today.
C.Researchers measure the changing temperatures by directly examining mud.
D.Greenland holds enough ice that might one day threaten life in coastal cities.
3.Which do you think is the best title of the passage?
A.Greenland Used to Be Much Greener
B.Earth Once Experienced Warm Periods
C.Coastal Cities Warned of Coming Disasters
D.Northwest Greenland, A Perfect Destination
About the Scottish Portrait Gallery
The Scottish National Portrait Gallery is one of Edinburgh’s most extraordinary buildings—a great red sandstone neo-gothic palace which sits proudly on the city’s skyline. Following a dramatic three-year redecoration, completed in December 2011, the Gallery now offers 17 new displays. Each of these explores different aspects of the story of Scotland and her people.
The Building
The Scottish National Portrait Gallery was designed by Sir Robert Rowand Anderson as a holy palace for Scotland’s heroes and heroines. A detailed Arts and Crafts decorative scheme, both inside and outside, with its glittering friezes, evocative murals and extensive sculptural embellishment, makes it a very special visitor experience.
The Collection
The Portrait Gallery’s collection is an exceptional national resource of over 30,000 fascinating images containing a rich variety of media and including many internationally outstanding works of art. The portraits depict(刻画) the men and women whose lives and achievements helped shape Scotland and the wider world. The Gallery is also home to the NGS’s outstanding collection of photographs which includes around 6,000 works by the early Scottish pioneers of the medium, Robert Adamson and David Octavius Hill as well as new works by leading-edge contemporary photographers.
Visitor Facilities
The new Portrait Gallery cafe serves a delicious menu of fresh dishes and classic recipes, using the very best local ingredients and seasonal produce. Our new shop offers a fresh twist on design-led gifts and souvenirs. The gallery now has all the facilities which today’s visitors expect, including a fantastic new lift, an Education suite and disabled access throughout the building.
1.What do we learn about the Scottish National Portrait Gallery?
A.It is well-known for its building. B.Every display reflects Scotland.
C.There are about 6,000 works in it D.It has a comparatively short history.
2.Its visitor facilities can be described a ______.
A.rare and user-friendly B.modern and all-round
C.characteristic and attractive D.beneficial and conventional
When I was just out of college, I managed to get my dream job as a trader in New York City on the floor of the American Stock (股票) Exchange. Though it was a proud ________ , the job was simply too physically ________ . I must stand in a crowd every day, which often ________ me in a mindset (心态) that held me back.
Manhattan is a walking town and it’s difficult to ________ when you have a disability. Taxis are expensive and riding the subway ________ dozens of steep steps to get below ________ . This left me only one ________ — the bus.
One night, after the ________ for my job, I was aching with my self-pity ________ it started to rain on my walk to the bus stop. I became more and more ________ without an umbrella, thinking I’d never ________ it in this city and telling myself, “this city is just too hard” and “maybe it is just not possible for a guy like me”.
And then, I ________ the most beautiful, short moment. A couple came rolling by on roller skates, hand ________ hand as they skated what seemed like the tango (探戈). They were all wet but they saw the ________ as an opportunity and romance.
I suddenly became ________ for waiting in the rain because I would have missed this beauty ________ if I had been in a taxi or on the subway. This, although ________ , was an important moment on my journey to discovering the ________ of achieving health and happiness. When I change my mindset, ________ for a moment, to what is possible and work to get rid of the self-limiting beliefs that ________ my daily actions, I will be on the road to a healthier, happier life.
1.A.adjustment B.achievement C.agreement D.treatment
2.A.tiring B.disappointing C.relaxing D.boring
3.A.reminded B.expected C.took D.left
4.A.go up B.get around C.set off D.show up
5.A.acquires B.supports C.requires D.surrounds
6.A.ground B.street C.town D.city
7.A.change B.chance C.idea D.choice
8.A.struggle B.work C.experience D.influence
9.A.before B.while C.when D.after
10.A.nervous B.curious C.scared D.upset
11.A.get B.make C.put D.watch
12.A.recalled B.intended C.witnessed D.realized
13.A.on B.by C.to D.in
14.A.rain B.tree C.wind D.cloud
15.A.astonished B.grateful C.anxious D.relaxed
16.A.exactly B.instantly C.entirely D.suddenly
17.A.strange B.small C.normal D.different
18.A.humor B.honesty C.power D.process
19.A.still B.yet C.also D.even
20.A.affect B.follow C.forbid D.harm
—What's wrong? It seems that you are losing control of the situation.
—_____ Don't stick your nose into my business.
A.Let me alone! B.I have no idea.
C.Are you kidding? D.Take your time!
A man ought to follow his heart when reading, or _____ he reads as a task will do him little good.
A.that B.how C.why D.what
______ for the efforts of medical staff, the spread of the novel coronavirus would not be controlled, which astonishes the whole world.
A.Were not it B.Were it not C.Had not it been D.If it were
