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Researchers Discover Why Humans Began Walking Upright

Most of us walk and carry items in our hands every day. These are seemingly simple activities that the majority of us don’t question. But an international team of r esearchers, including Dr. Richmond from GW’s Columbian College of Arts and Sciences，have discovered that human walking upright, may have originated millions of years ago as an adaptation to carrying scarce, high- quality resources. The team of researchers from the U. S., England, Japan and Portugal investigated the behavior of modern-day chimpanzees as they competed for food resources，in an effort to understand what ecological settings would lead a large ape — one that resembles the 6 million-year old ancestor we shared in common with living chimpanzees — to walk on two legs.

“These chimpanzees provide a model of the ecological conditions under which our earliest ancestors might have begun walking on two legs, “，said Dr. Richmond.

The research findings suggest that chimpanzees switch to moving on two limbs instead of four in situations where they need to monopolize a resource. Standing on two legs allows them to carry much more at one time because it frees up their hands. Over time，intense bursts of bipedal activity may have led to anatomical changes that in turn became the subject of natural selection where competition for food or other resources was strong.

Two studies were conducted by the team in Guinea. The first study was conducted by the team in Kyoto University’s “ outdoor laboratory ” in a natural clearing in Bossou Forest. Researchers allowed the wild chimpanzees access to different

combinations of two different types of nut —the oil palm nut，which is naturally widely available, and the coula nut, which is not. The chimpanzees’behavior was monitored in three situations:(a) when only oil palm nuts were available,(b)when a small number of coula nuts were available，and(c) when coula nuts were the majority available resource.

When the rare coula nuts were available only in small numbers, the chimpanzees transported more at one time. Similarly, when coula nuts were the majority resource, the chimpanzees ignored the oil palm nuts altogether. The chimpanzees regarded the coula nuts as a more highly-prized resource and competed for them more intensely.

In such high-competition settings，the frequency of cases in which the chimpanzees started moving on two legs increased by a factor of four. Not only was it obvious that bipedal movement allowed them to carry more of this precious resource, but also that they were actively trying to move as much as they could in one go by using everything available 一even their mouths.

The second study, by Kimberley Hockings of Oxford Brookes University, was a 14-month study of Bossou chimpanzees crop-raiding, a situation in which they have to compete for rare and unpredictable Resources. Here, 35 percent of the chimpanzees activity involved some sort of bipedal movement, and once again, this behavior appeared to be linked to a clear attempt to carry as much as possible at one time.

参考答案：BAEFC

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2020职称英语补全短文练习题(1) The Invader of AIDS The invader is small, even in the microscopic world of bacteria and viruses. It is alive only in the strictest sense of the world. It had no intelligence, no means of mobility, no methods of defense in the outside world. It is fragile, easily killed by common household bleach(漂白剂)and even short periods outside the body. 1 . It is the AIDS virus, and it is a killer. AIDS is a disease, caused by a virus that breaks down part of the body’s immune system, leaving a person defenseless against a variety of unusual life-threatening illnesses.2 . The body’s immune system normally provides us the weapons we need to win constant battles with invading viruses, bacteria and other invading organisms. His defense system is powerful but not perfect. 3 . We do not even know that anything is happening. But the AIDS virus acts differently from other invaders. It attacks the very cells that normally protect us. 4 . It turns our own white blood cells into mini-factories or making more viruses. Each time a cell is taken over, it fills up with thousands of new viruses, dies and releases those viruses, with attack more white blood cells. After enough attacks, our defense system is weakened and certain infections and conditions that we normally fight off with no problem take advantage of his weakness.

职称英语理工类A真题-2010-打印版(含答案解析)

++2010年全国职称英语综合类（A级）考试真题及答案 第一部分：词汇选项（第1-15题，每题1分，共15分） 下面每个句子中均有1个词或短语划有底横线，请为每处划线部分确定1个意义最为接近的选项。 1. Her father was a quiet man with graceful manners. A. bad B. polite C. similar D. usual 2. Patricia stared at the other girls with resentment. A. love B. surprise C. doubt D. anger 3. Your dog needs at least 20 minutes of vigorous exercise every day. A. energentic B. physical C. regular D. free 4. Our aggrangements were thrown into complete turmoil. A. failure B. confusion C. doubt D. relief 5. Steep stairs can present a particular hazard to older people. A. evidence B. danger C. case D. picture 6. I enjoyed the play-it had a clever plot and very funny dialogues. A. long B. original C. humorous D. boring 7. He demolished my arguments in minutes. A. disproved B. disputed C. accepted D. supported 8. The two banks have announced plans to merge next year. A. combine B. sell C. close D. break 9. Regular visits from a social worker can be of immense value to old people living alone. A. immediate B. great C. equal D. moderate 10. I want to provide my boys with a decent education. A. private B. general C. good D. special 11. Lower taxes would spur investment and help economic growth. A. attract B. encourage C. require D. spend 12. He was kept in appalling conditions in prison. A. critical B. temble C. necessary D. normal 13. I can't put up with my neighbor's noise any longer, it's driving me mad. A. measure B. generate C. tolerate D. reduce 14. The project required ten years of diligent research. A. hardworking B. scientific C. basic D. social 15. He was rather vague about the reasons why he never finished school. A. unclear B. bright C. bad D. general 第二部分：阅读判断(第16-22题，每题1分，共7分) 下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。 The Writing's on the Wall? Is it art or is it just vandalism (野蛮行为)? Well, it's still a crime, but graffiti (涂鸦) has changed since the days of spraying your name on a wall to mark your territory. Street art has become much more sophisticated since a 17-year-old called Demetrius started spraying his "tag" , TAKI 183, all over the New York underground in 1971, and hip - hop culture was born. Hip-hop is a mixture of art, music and dancing, poetry, language and fashion. It came from young inner-city people who fell left out by their richer classmates and who were desperate to express themselves in any way they could. An experiment to control the spread of graffiti in Rochdale, Creater Manchester, has been sosuccessful that plans have been made by local street artists for an international convention in June. "We're planning to get people together from different countries like France and Cermany for a week, " says Liam, one of the organizers. The scheme started in 2000, and has attracted people of all age groups and both sexes. " We all share a commen interest and get on really well with each other. " The first site to be chosen was a subway. " Before we began, people were afraid to use the subway. We had it cleaned up and now, with all the artists hanging out down there, people are using it again. People can relate to graffiti much more now. " By providing places to display their talents legally, there has been a fall in the amount of "tagging" on people's private property. Street artists Temper developed his drawing skills at a young age. In art classes at school he was really frustrated because the Art teacher didn't spend time with him. They thought he was already very good at art and so spend more time with other students. So, at 12 years old, Temper started painting with all these guys he'd hooked up with who were about 22 years old. He looked