1 . In habitats across the planet, animals periodically drop everything to walk, fly or swim to a new place. Some animals such as whales and geese learn migration paths by following their parents. Others, including small songbirds, gain the distance and direction of their migration within their genetic code. And some animals use a combination of genetics and culture to guide their migration.
Another group of migrators does not quite fit either model, and researchers have only recently started to figure out how they find their way. The Cory’s shearwater is an oceangoing seabird that migrates over the Atlantic every year. The young do not migrate with their parents, so culture cannot explain their journeys. And the exact paths vary wildly from individual to individual, making genetics equally unlikely.
Cory’s shearwaters are long-lived, rarely producing young successfully before age nine. This leaves an opening for learning and practice to develop their migration patterns. Researchers call this the “exploration-refinement”, and until now it has been hypothetical (假设的) because of difficulties in tracking migratory animals’ movements.
But a team of researchers has done that by attaching small geolocators to more than 150 of the birds aged four to nine. They found that younger birds traveled longer distances, for longer periods, and had more diverse paths than older birds. “We finally have evidence of the ‘exploration-refinement’ for migratory birds,” says Letizia Campioni, who led the study. Younger Cory’s shearwaters are able to fly just as fast as the adults——but they do not, suggesting that the young do more exploring, which gradually fades as they mature and settle into a preferred course.
“Although it may seem less efficient than other strategies, exploration refinement could be beneficial to birds and other organisms in a rapidly changing world due to unpredictable man-made changes,” says Barbara Frei. “It might be safer to repeat a behavior that was recently successful than to rely on patterns that were perfected long ago but might no longer be safe.”
1. What is the first paragraph mainly about?| A．It describes animals’ habitats. | B．It compares different species. |
| C．It talks about migration models. | D．It introduces a tracking technology. |
| A．The opening for learning and practice. |
| B．The unique living habit of Cory’s shearwaters. |
| C．The process scientists track Cory’s shearwaters’ movements. |
| D．The way Cory’s shearwaters form their migration patterns. |
| A．They travel as much as adult birds. | B．They lower the speed for exploration. |
| C．They move in a predictable manner. | D．They look for a course with their parents. |
| A．Exploration refinement contributes to birds’ adaptability. |
| B．Man-made changes make migration easier. |
| C．Animals make a safer journey via a fixed track. |
| D．A combination of strategies assures migration success |
2 . After years of heated debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and transported to the park. By last year, the Yellowstone wolf population had grown to more than 170 wolves.
Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States, but they were gradually displaced by human development. By the 1920s, wolves had practically disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around.
The disappearance of the wolves had many unexpected results. Deer and elk populations — major food sources (来源) for the wolf — grew rapidly. These animals consumed large amounts of vegetation (植被), which reduced plant diversity in the park. In the absence of wolves, coyote populations also grew quickly. The coyotes killed a large percentage of the park’s red foxes, and completely drove away the park’s beavers.
As early as 1966, biologists asked the government to consider reintroducing wolves to Yellowstone Park. They hoped that wolves would be able to control the elk and coyote problems. Many farmers opposed the plan because they feared that wolves would kill their farm animals or pets.
The government spent nearly 30 years coming up with a plan to reintroduce the wolvers. The U.S. Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone. Today, the debate continues over how well the gray wolf is fitting in at Yellowstone. Elk, deer, and coyote populations are down, while beavers and red foxes have made a comeback. The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.
1. What is the text mainly about?| A．Wildlife research in the United States. |
| B．Plant diversity in the Yellowstone area. |
| C．The conflict between farmers and gray wolves. |
| D．The reintroduction of wolves to Yellowstone Park. |
| A．Damage to local ecology. |
| B．Preservation of vegetation. |
| C．A decline in the park’s income. |
| D．An increase in the variety of animals. |
| A．Doubtful. | B．Uncaring. | C．Positive. | D．Disapproving. |
3 . On Saturday 24 August 1918, it was raining cats and dogs and thundering over a city called Sunderland on the northeast coast of England. The storm lasted for only about ten minutes. People were surprised to see that it was not just rainwater falling from the sky. There were fish falling down, too! People came out to find out what was happening. They could not believe their own eyes. There were thousands of fish—sand eels (沙鳗)—lying on the ground. They were about seven centimeters long, and all were frozen solid (冻成硬块).
Sand eels swim together in large groups, often in sandy water, and are often found in large numbers in the North Sea, which reaches out to the east of Sunderland. How was it possible for these sand eels to fall from the sky and land on Sunderland?
Scientists believed the heavy thunderstorm that afternoon may have caused a waterspout (水龙卷). Waterspouts can be formed when strong winds move quickly in a circle over water. They are so powerful that anything less than one meter in length can be taken into them and forced into the clouds. The clouds carry whatever has been taken into them for long distances —sometimes over 150 kilometers. It’s very cold up there and everything soon freezes solid.
For hundreds of years there have been reports of small animals being taken into the sky through waterspouts. In 2009, dead tadpoles rained down on the city of Nanao in Japan. In 2012, fifty kilos of prawns fell from the sky over Sri Lanka. In 2017, fish fell on the coastal city of Tampico in Mexico.
It must be a very strange experience to see fish raining down on you. It would probably hurt if one fell on your head! With climate (气候) change and many reports of terrible storms, will the time ever come when it may really begin to rain cats and dogs?
1. What do we know about the sand eels that landed on Sunderland?| A．They were few in number. | B．They came in different sizes. |
| C．They were still alive when landing. | D．They probably came from the North Sea. |
| A．Clouds. | B．Waterspouts. | C．Strong winds. | D．The waters of the sea. |
| A．raining sea animals is not new in history | B．the environment is not pleasant in Japan |
| C．waterspouts can reach as far as Japan | D．different animals can fall in different countries |
| A．Our health. | B．Our environment. | C．The wild animals. | D．The news reports. |
4 . Tips for Green Travel with Kids
Travelling doesn’t mean letting go of all the eco-friendly choices we work so hard to achieve in our daily life. Here are a few tips for green travel with kids.
Booking nonstop flights whenever possible will reduce carbon emissions (碳排放). If the closest local airport doesn’t have nonstop flights to a certain place, check with other local airports to see if nonstop flights are available.
It’s easy when travelling to pull in to fast food restaurants for snacks.
| A．Walking is good for your health. |
| B．Try to cut back to save water and energy. |
| C．But you can pack healthy food from home. |
| D．Travelling is a great chance to introduce your kids to the world. |
| E．Reusable water bottles are easy to bring along wherever you travel. |
| F．Save energy by turning off the hotel room lights when you head out for the day. |
| G．You might have to drive a bit farther, but saving on carbon emissions makes it worthwhile. |
The Vikings, whose ancestors came from Scandinavia, were the first Europeans
Later a man, Biarni set sail from Iceland in search
In the year 1002, Leif, Eric the Red’s son, followed Biarni’s directions and sailed to
6 . Just as we take care of our friends and families, our homes and Mother Earth take care of us. Our homes give us a place of shelter that
“Thank you, home, for allowing me to live
You can do so as often as you like and anytime you feel particularly thankful for the many gifts that you have
| A．bend | B．handle | C．react | D．stand |
| A．unselfish | B．skillful | C．cheerful | D．amazing |
| A．animals | B．oceans | C．plants | D．waters |
| A．promote | B．show | C．influence | D．satisfy |
| A．sources | B．memories | C．power | D．strength |
| A．Express | B．Accept | C．Ban | D．Deserve |
| A．attacks | B．attracts | C．appreciates | D．provides |
| A．fond | B．aware | C．informed | D．confident |
| A．accused | B．robbed | C．warned | D．reminded |
| A．road | B．word | C．way | D．place |
| A．safe | B．dull | C．quiet | D．public |
| A．though | B．because | C．unless | D．until |
| A．beside | B．beyond | C．within | D．in |
| A．admitting | B．supporting | C．challenging | D．surviving |
| A．live | B．call | C．focus | D．feed |
| A．examine | B．explain | C．experience | D．describe |
| A．adventure | B．wisdom | C．loss | D．honor |
| A．anger | B．worry | C．joy | D．desire |
| A．brought | B．purchased | C．exchanged | D．received |
| A．shocks | B．monitors | C．protects | D．follows |
7 . My previous home had a stand of woods behind it and many animals in the backyard. That first year, I
That second year, the rabbits
By year three, the rabbits and the groundhog were back. The groundhog
| A．avoided | B．started | C．stopped | D．suggested |
| A．business | B．fun | C．problem | D．right |
| A．help | B．cheat | C．threat | D．exception |
| A．play | B．miss | C．admire | D．trust |
| A．feared | B．discovered | C．touched | D．remembered |
| A．proved | B．decided | C．noticed | D．understood |
| A．extreme | B．increasing | C．additional | D．inspiring |
| A．squirrel | B．rabbit | C．peanut | D．carrot |
| A．before long | B．long ago | C．over and over | D．all over again |
| A．eating | B．playing | C．sitting | D．sleeping |
| A．Next | B．Once | C．Soon | D．Lately |
| A．carefully | B．suddenly | C．violently | D．patiently |
| A．also | B．thus | C．just | D．still |
| A．thought | B．doubted | C．designed | D．realized |
| A．While | B．Or | C．So | D．For |
| A．fixed | B．placed | C．hung | D．kept |
| A．surprise | B．delay | C．move | D．shake |
| A．Even if | B．Ever since | C．As far as | D．So long as |
| A．welcomed | B．minded | C．hated | D．expected |
| A．trade | B．chance | C．task | D．life |
8 . One day, a woman walked into a pet store to buy a bird for her Thanksgiving Day party. The guy said, “We only have one parrot. But I think you do not want it because it can talk…” The woman said happily, “That’s great. I’ve always wanted a talking bird.” So the guy said, “Since you are a nice lady, I’ll give it to you as a gift.”
And the lady went home and put the bird on her bed and walked out of the room. But as soon as she walked into the kitchen, the bird started to speak dirty words as loud as it could. The woman walked back into the room thinking, “I can’t have this at my party!” So she took the bird and put it in the fridge. A few hours later, while the woman was eating, she remembered that her bird was still in the fridge. Quickly, she opened the door and found it was shivering. Then she took out the bird at once. She said to the bird, “I’ll keep you out of there if you don’t use that language again. Do you agree with me?”
The bird nodded and asked, “Can I just ask a quick question?” The lady nodded and said, “Yes, you may.” The bird pointed at the turkey behind him and asked, “What did he do?”
1. The woman went into the pet store because ________.| A．there were lots of nice birds in it |
| B．she wanted to buy a bird to make a big meal |
| C．she wanted to buy a bird for Thanksgiving Day party |
| D．she wanted to buy a bird for his son’s birthday |
| A．发抖 | B．睡觉 | C．生气 | D．跳动 |
| A．how the turkey was put into the fridge. | B．why itself was in the fridge. |
| C．who could be in the fridge. | D．why the turkey was in the fridge. |
| A．she wanted to cook it on Thanksgiving Day | B．the bird spoke dirty words |
| C．the bird liked living in the cold place | D．she thought it’s the best place for it to live in |
9 . I woke up by my dog barking in the early morning. I went outside to find a koala (考拉) at the yard gate wanting to enter. It was the first time that I had
I was wondering why he was here, as koalas
He just sat there, apparently
I rushed into my room and came out with some iodophor (碘伏药水). It was not a
After the treatment, I watched the koala finally
| A．caught | B．encountered | C．searched | D．missed |
| A．chance | B．relief | C．surprise | D．message |
| A．frequently | B．slightly | C．mostly | D．rarely |
| A．Once more | B．Ever since | C．Just then | D．Then again |
| A．sought | B．drove | C．followed | D．cast |
| A．in pain | B．in order | C．in comfort | D．in disappointment |
| A．quick | B．close | C．eager | D．anxious |
| A．features | B．symbols | C．signs | D．series |
| A．crucial | B．small | C．distinct | D．tricky |
| A．ignore | B．answer | C．understand | D．expect |
| A．touched | B．felt | C．patted | D．treated |
| A．appealed to | B．referred to | C．occurred to | D．addressed to |
| A．help | B．advice | C．approval | D．fortune |
| A．exploring | B．rushing | C．jogging | D．disappearing |
| A．experience | B．survive | C．escape | D．have |
When you think of the Arctic (北极), you imagine an icy land of pure white snow. Others imagine it as the last really clean place left on Earth. We have polluted the deepest oceans with plastic trash, and now, CNN says, “It’s the Arctic’s turn”
German scientists have recently found micro plastics (微塑料) in Arctic snow, the Associated Press reported. Micro plastic are pieces of plastic smaller than 5 millimeters. Sadly, the scientists found 1,800 pieces of micro plastic per liter of snow.
How is plastic pollution reaching the Arctic? According to scientists, “It’s readily apparent (显然的) that the majority of the micro plastics in the snow comes from the air.” they fall off of plastic objects and are moved by the wind, just like dust. They mix with ice in the air and fall to the ground as snow. Finding these plastics in Arctic snow means that we may breathe them in. An even higher amount of micro plastic was found in the snow around cities.
The high concentrations (浓度) found in snow samples (样本) suggest micro plastics, which contain rubber or chemical used in synthetic fabrics (合成纤维), may cause significant air pollution.
Are they bad for us? Scientists cannot answer this question for now, according to the World Health Organization. We do know that our bodies cannot take in “large” pieces of micro plastics. However, if the plastics are small enough, they can find ways into our bodies and stay there for a long time, which can be bad for our health. What’s more, earlier studies have shown that micro plastics may contributes to lung cancer risk, heightening the need to further assess (评估) the risks of taking them in, the study said.
Micro plastics have also been found in rivers and oceans around the world. Previous research has found that they flow long distances and into tour oceans, damaging ecosystems (生态系统) along the way. They start in our wastewater when we wash clothes with plastic fibers. The waste water then flows into rivers and out to sea, where they are eaten by sea animals. If people then eat these animals, it means that we’re eating the plastic as well.
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