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题型:阅读理解 题类:常考题 难易度:容易

高中英语-牛津译林版-高二上册-模块5 Unit 3 Science versus nature

阅读理解

    Have you ever wondered when dogs first became “man's best friend” and the world's favourite pet? If you have then you're not alone. When and where dogs first began living side-side with humans are questions that have stirred hot debate among scientists. There are a few hard facts that all agree on. These include that dogs were once wolves and they were the first animal to be domesticated(驯养) by humans. They came into lives some 15000 years ago, before the dawn of agriculture.

    Beyond that, there is little agreement. The earliest bones found that are unquestionable dogs and not wolves date from 14,000 years ago. However, 30,000-year-old skulls have been discovered in France and Belgium that are not pure wolf and some scientists think could be dogs.

    With such puzzling evidence, many scientists are now turning to DNA to find out when and where dogs were first domesticated. In one research project, tens of thousands of blood samples have been taken from street dogs around the world. The plan is to compare them with those of wolves. It's even possible to analyse DNA from ancient bones. Tiny pieces of the 30,000-year-old skulls mentioned earlier are currently being studied, and another DNA study has already shown that ancient dogs preserved in the Alaskan ice-fields evolved from Asian wolves, not American ones.

    Indeed, the ancient DNA may turn out to be more informative than the DNA of living dogs. Because dogs have accompanied humans around the world for thousands of years, their current distribution may tell us very little of their origins. This is why different groups of scientists believe that dogs variously originated in eastern Asia, Mongolia, Siberia, Europe or Africa.

    But why were the animals domesticated in the first place? The most recent theory is that dogs domesticated themselves, initially living in and around our ancient villages to eat any food thrown out. Today, this is a way of life still shared by three -quarters of a billion unowned dogs worldwide.

(1)、Which is the only statement generally agreed on by scientists studying dogs?

A、They originally were used as farm animal B、They evolved from wolves found in Europe C、They helped the development of agriculture D、They were the first animal to be kept as pets
(2)、Why does the writer first mention the 30,000-year-old animals skulls?

A、To show that dogs were much larger in the past B、To prove that dogs developed from Asian wolves C、To suggest that dogs may have evolved much earlier D、To argue that dogs were first kept in France and Belgium
(3)、How did scientists determine the origins of the ancient dogs found in Alaska?

A、By examine the animals' DNA B、By analyzing the age of their bones C、By studying the shape of their skulls D、By comparing them with modern dogs
(4)、Why did dogs start living with humans?

A、Because they were attracted by food B、Because they were trapped by humans C、Because they couldn't survive in the wild D、Because they were trained to protect villages
举一反三
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    More companies and recyclers are taking steps to ensure that old electronic devices such as TVs and computers aren't sent to poor countries.

    The Basel Action Network, a Seattle-based non-profit that largely exposed the overseas discarding (丢弃) of US electronic waste, on Thursday launched a programme to use third-party employees to certify (证实) recyclers who don't export dangerous electronic waste.

    The so-called e-Steward recyclers will also agree not to discard the waste in US landfills and agree to meet other criteria. The certification is intended to provide companies and consumers with some assurance that the waste, which can include toxins (毒素) such as lead and mercury, is disposed of safely.

    The Government Accountability Office, in a 2008 report, declared that US electronic waste was often disposed of unsafely in such countries as India. There, workers recycle gold, silver and copper from the waste, often in open-air acid baths.

    The Basel Network also says it won assurances from 13 organizations, including Samsung, Bank of America, Wells Far-go, that they'll use e-Steward recyclers whenever possible. Wells Fargo had already been using recyclers who declared not to export. So far, Basel has certified three recyclers and seven sites.

    Before e-stewards, even, companies that wanted to avoid export of electronic waste had to “hope for the best”, when, they handed their waste to recyclers, says Robert Houghton, president of Ohio-based recycler Redemtech. It is an e-Steward that counts major companies among its customers. “Now, they can get some proof,” Houghton says.

    Basel's standards compete with another set launched in January. It was made by industry and backed by the Environmental Protection Agency.

    That standard, called R-2, doesn't ban the export of dangerous electronic waste but requires that it be handled safely. Instead of a ban, the Institute of Scrap Recycling Industries says, efforts should be made to help poor countries develop safe recycling.

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    Jack Ma, whose Chinese name is Ma Yun, became the richest man in China, when the company he founded floated on the stock market last year with a value of around £140 billion. Here are some interesting stories about him.

    ⒈"Beer" was the first word that Jack Ma searched for on the Internet

    In 1995 Ma made his first trip to the US and used the Internet for the first time. After searching for "beer" and then "China", he saw that no results came up relating to China. He decided to set up a Chinese website一the seed for Alibaba had been sown.

    ⒉Jack Ma applied to study at Harvard 10 times and was rejected (拒绝) each time

Ma failed the entry exams for colleges in China three times and was also rejected for many jobs in China, including one at KFC. He was turned down by the Harvard 10 times after applying.

    ⒊Jack Ma learnt English by giving tourists free guides一every day for nine years.

    Limited resources meant it was difficult to learn English when Ma was young. However, he found that he could learn the language by giving tourists free tours around his hometown of Hangzhou一something that he did during his teenage years every morning for nine years. He found everything they said and did was so different from what he had been taught at school and by his parents, which opened his mind.

    ⒋Jack Ma named his company Alibaba because it's a globally known story

Ma simply wanted his company to have a global and interesting name, and realised that Alibaba is a story known across the world and it begins with A, appearing top of lists.

    The company was founded in 1999 and since then has grown from 15 employees to more than 30,000. Ma hopes to keep expanding Alibaba outside of China.

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    You know those nutrition guidelines the government issues every few years? It turns out that following them isn't just good for your health. It's good for the planet, too.

    " What we found is that impacts vary across nations, but in the high­impact nations, in general, you can see that, if you follow a nationally recommended diet, despite the fact that these diets don't mention explicitly—or most of them don't explicitly mention—environmental impacts, that you are going to have lower environmental impacts due to that. So that's sort of fairly clear across all the high­income nations." said Paul Behrens, an environmental scientist at Leiden University in the Netherlands.

    The food we eat takes a big toll on the environment. A third of the ice­free land on Earth is used for agriculture, and according to some estimates, producing food accounts for roughly a fifth of all human­caused greenhouse gas emissions. Fertilizer runoff also leads to other problems, like the algae blooms in Lake Eerie and the Dead Zone in the Gulf of Mexico.

    However, following dietary guidelines would reduce those impacts, especially in wealthy countries like the US. "Most of the reductions come from meat and dairy," which have an outsized impact on land use and pollution, and are a major source of greenhouse gases.(That's partly due to cow farts. Seriously.) Following the suggestions would also mean eating fewer calories, since many people here eat more than they need.

    Overall, in high­income countries, Behren's team estimates that following the rules could result in as much as a 17 percent reduction in land use, a 21 percent reduction in nutrient pollution, and a 25 percent drop in agricultural greenhouse gas emissions. Cutting down on how much food we waste—which is roughly a third in the US—could help even more. The results are in the Proceedings of the National Academy of Sciences.

    Of course, people are notoriously bad at following diets. But: "These nationally recommended guidelines do actually have a knock­on effect on other areas of policy making. So if I'm developing a new healthy­eating­for­schools program then that's going to be based off a lot of detail that I get from the nationally recommended guidelines. So while it might not necessarily be the case that people follow directly …they actually are quite influential on the preparation of other advice."

    It seems that a smaller environmental footprint and a healthier lifestyle could go hand in hand.

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    I was 16 when my father finally decided he would send me to wilderness camp for several months. He had threatened to do it many times before, but my mother had always managed to prevent him from doing so. This ti me he insisted on doing it.

    The latest incident was the last straw. Impulsively (冲动地), I had pushed Mr. Ford, my math teacher, down a flight of steps at school. He broke his arm in two places. Anyway, he had agreed not to accuse me as a favor to my dad, who was in the middle of a tight race for sheriff (执法官) in our town. But my reckless behavior had my dad's closest advisor talking.

    "John, he's your son and he's a kid, but he is dragging you down," I heard Jake Hutch tell my dad through his closed office door the night after I pushed Mr. Ford. "If you can't make your son obey the rules, how can you make the law obeyed in this town?"

    So, off to Pisgah National Forest I went. I imagined hours of untold abuse at the hands of some strong sergeants (军士). I was determined not to be broken. I was who I was,

    Nearly every day for six months, a small group of other troubled teens and I carried our 30-pound backpacks on a difficult journey covering about 10 miles. We hiked in a rough wilderness that seemed untouched by civilization.

    Our sergeants were firm but kind, not frightening as I had imagined. We learned how to make a fire without matches and create a shelter with branches and grass. We learned which plants were safe to eat out in the wild. I felt myself change. I was calm and often reflective. My old, impulsive self was gone.

    One morning, six months later, my dad came to pick me up. I ran to hug him and saw happiness and love in his eyes.

    "So what's it like being sheriff?" I asked on the ride home.

    "I lost the race, Danny," he said.

    "I'm sorry, Dad." I knew my behavior probably had a lot to do with the defeat.

    Dad squeezed my shoulder and brought me close. "As long as I don't ever lose you, I'm okay."

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