When people first walked across the Bering Land Bridge thousands of years ago, dogs were by their sides, according to a study published in the journal Science. Robert Wayne of the University of California, Los Angeles, and Jennifer Leonard of the Smithsonian Institute, used DNA material--some of it unearthed by miners in Alaska--to conclude that today's domestic dog originated in Asia and accompanied the first humans to the New World about 10,000 to 15,000 years ago. Wayne suggests that man's best friend may have enabled the tough journey from Asia into North America. "Dogs may have been the reason people made it across the land bridge," said Wayne. "They can pull things, carry things, defend you from fierce animals, and they're useful to eat." Researchers have agreed that today's dog is the result of the domestication of wolves thousands of years ago. Before this recent study, a common thought about the precise origin of North America's domestic dog was that Natives domesticated local wolves, the descendents of which now live with people in Alaska, Canada, and the Lower 48. Dog _ from a Fairbanks-area gold mine helped the scientists reach their conclusion. Leonard, an evolutionary biologist, collected DNA from 11 bones of ancient dogs that were locked in permafrost until Fairbanks miners uncovered them in the 1920s. The miners donated the preserved bones to the American Museum of Natural History in New York City, where they remained untouched for more than 70 years. After borrowing the bones from the museum, Leonard and her colleagues used radiocarbon techniques to find the age of the Alaska dogs. They found the dogs all lived between the years of 1450 and 1675 A.D., before Vitus Bering and Aleksey Chirikov who were the first known Europeans to view Alaska in 1741. The bones of dogs that wandered the Fairbanks area centuries ago should therefore be the remains of "pure native American dogs," Leonard said. The DNA of the Fairbanks dogs would also expose whether they were the descendents of wolves from... The first humans into the New World brought dogs along with them because _ . A) dogs fed on mice B) dogs were easy to keep C) dogs helped protect their resources D) dogs could provide excellent service
D
(Question)
As Paige watched the other kids playing football in her local park she longed to join in. But at nearly nine stone (1stone equals 6.35 kilograms), the 11-year-old was too big to enjoy her favorite sport, she was well on her way to being another overweight member of her family. Mandy, her mum was 17th 10 lb and Anne, her grandma 15th 10 lb. Mandy, 39, and Anne, 67, both have a sweet tooth and share a love of all things stodgy. Recent figures show that two-thirds of kids will be dangerously fat by 2050, and overweight kids often become obese adults and live shorter lives as they are at higher risk of everything from heart disease to cancer and type-2 diabetes. Mandy says she knew things had to change for her and her family. Mandy's mum Anne had an even greater motivation for wanting to slim down. Last autumn Paige went along to the Slimming World to keep her mum and grand ma company. In the first week on the Slimming World eating plan, Mandy lost a whopping 9.5lb. Mandy asked Paige to join in. They believed the Free2Go plan is balanced and nutritious and doesn't deprive Paige of anything. Supporting and encouraging each other the whole time, Anne, Mandy and Paige all whittled away their waistlines. Mandy says: "My back problems have cleared up." Anne has also noticed a real difference in her health. She says: "I feel like I've got my old energy back." Paige is almost as delighted with her new wardrobe as she is about her foot balling skills. Mandy adds: "I'm just so proud of Paige. I felt awful because I knew her weight problems were a result of my bad eating habits. But when I see her now it's like she's a different person." Which of the following is TRUE according to the passage? A) Overweight people usually live longer. B) Free2Go plan can't make people healthy. C) Paige liked the game of football very much. D) Sweet food can make people suffer heart disease.
(Answer)
C
Question: Why Doesn't Anybody Copy Apple? Apple's products are the envy of the world. They have been spectacularly successful and are widely imitated, if not copied. The minute Apple crystallizes a product, everyone knows how to compete. This idea that the basis of competition is set by Apple and then the race is on to climb the path of improvement is unquestionable. When Apple releases a product that defines a category or dramatically changes the structure of an industry, it becomes obvious what needs to be built. But what I wonder is why everyone wants to copy Apple's products but nobody wants to copy being Apple? I can think of two reasons. Firstly, Apple is not worth copying because it's not successful; secondly, Apple's success cannot be copied because it is a magical process. There is a great deal of evidence for the first hypothesis. The idea of Apple being successful is not something reflected in its stock price. Being valued lower than the average company in the S&P 500 indicates that to whatever degree Apple was successful in the past, it's not seen by the vast majority of observers as successful in the future. Why should one bother copying Apple if it results in being punished with a low valuation? If one works really hard at innovation and then that innovation becomes commoditized very quickly, why should one bother? When innovation practitioners are asked what makes Apple successful,the answers regarding the cause of this success border on the mythical.The climax of this hypothesis is the "chief-sorcerer"theory of success which places one magician,like Steve Jobs,in charge of casting all the right spells What about Apple's own opinion of what makes it tick? Tim Cook refers to a great team and integration of hardware, software and services as unique Apple advantages. It's a better explanation. Integration is something that can take a long time, but it is possible with great effort. A few companies are starting to make moves in that direction, but efforts are half-hearted. There is no "move the Earth" panic... According to the passage, other companies don't "copy being Apple" because _ . A) Apple is not a successful company B) they have no access to relevant resources C) it's hard to find a magician like Steve Jobs D) being Apple takes more than time and efforts
Answer:
D