Read the following article and select the best answer. Article: Elephants have impressed us for centuries. They are big, clever, and sociable. But what if someone told you that they may also hold the key to fighting cancer? People have been wondering why elephants do not develop cancer, even though they have life spans that are similar to humans, living for around 50 to 70 years. Now scientists believe they know why. A team at the University of Chicago, Us has found that elephants carry a large number of genes that stop tumors from developing. To be precise, they found 20 copies of an anti-tumor gene called TP 53 in elephants. Most other species, humans included, only carry one copy. According to the research, which was recently published on the online science network BioRxiv, the extra copies of the gene improved the animal's sensitivity to DNA damage. This lets the cells quickly kill themselves when damaged before they can form deadly tumors. "An increased risk of developing cancer has stood in the way of the evolution of large body sizes in many animals," study author Dr Vincent Lynch told The Guardian. If every living cell has the same chance of becoming cancerous, large creatures with long life spans like whales and elephants should have a greater risk of developing cancer than humans and mice do. But across species, the risk of cancer does not show a connection with body mass. _ was found by Oxford University scientist Richard Peto in the 1970s and later named "Peto's paradox". Evolutionary biologists believe it results from larger animals using protection that many smaller do not, In the elephant's case, the making of TP53 is nature's way of keeping this species alive. The study also found that when the same genes were brought to life in mice, they had the same cancer resistance as elephants. This means researchers could use the discovery to develop new treatments that can help stop cancers from spreading or even developing in the first place. "Nature has already figured out how to prevent cancer," said Joshua Schiffman, an oncologist at the School of Medicine,... Question: Why are elephants unlikely to develop cancer? - They have a large body size - They carry many genes that keep tumors from developing - Certain genes in their body kill existing tumors - Their genes suffer no DNA damage
They carry many genes that keep tumors from developing

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Read the following article and select the best answer. Article: When 47yearold volunteer Susan Boyle stepped onto the stage of Britain's Got Talent and announced she was unemployed, had never been married and "never been kissed, actually", few in the audience would have wondered why. This Ms Boyle, looking unfashionable, from a village in Scotland, shocked the three judges and the audience with the song I dreamed a dream on a show of Britain's Got Talent. She couldn't hide the awkwardness when walking to the center of the stage in a house dress, and everyone -- including the judges -- seemed laughing at her when she said she wanted to be as successful as Elaine Paige. As soon as she began singing, however, everyone in the hall fell silent, then rose within seconds to admire her wonderful voice as the celebrity judges sat openmouthed, and remained standing to the end. After her performance, one of the judges Piers Morgan said,"Without doubt that was the biggest surprise I've had in three years of this show. When you stood there everyone was laughing at you. No one is laughing now. That was amazing." Actress Amanda Holden followed,"I'm so thrilled because I know that we everybody were against you. I honestly think that we were all being very cynical and I think that's the biggest wakeup call ever." Susan obviously won over the hearts of millions around the world with success spreading across the Atlantic. Hollywood actor Ashton Kutcher, who has nearly 1.5 million followers, speaks highly of her. Kutcher posted a link to the video clip . The Scottish talent made her live American show via satellite connection on CBS's The Early Show, doing an interview and singing live from her room. And she already accepted an invitation from talk show hostess Oprah Winfrey. Now Boyle has become one of the world's hottest celebrities. The video clip of her performance has been viewed more than 50 million times on Youtube, becoming a hit on the Internet. Question: At the beginning of the show, almost everybody _ . - looked forward to her wonderful performance - was attracted by her beautiful dress - looked down upon her - placed great hope on her
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looked down upon her

Ques: Read the following article and select the best answer. Article: More and more schools are being designed and used in ways that are friendly to the environment. These so-called green schools use less energy, cost less to run and are good for students. The newly renovated Sidwell Friends Middle School in the District has been awarded the highest rating by the U.S. Green Building Council for having a positive impact on the environment-a rare honor. Soon the school will treat and re-use its wastewater, saving hundreds of thousands of gallons of water per year. The recycled water from sinks and toilets, which can't be used for drinking, will be color1ed blue, "so we know it's recycled, just in case it gets into the water fountains -not that it would," joked Emily Bernstein, 14, a Sidwell student and building tour guide. Water fountains will still use fresh city water. Sidwell students are studying the building itself in science classes to help them learn first-hand the positive impact of green buildings. It's affecting how they view the world around them. "If you see a [building] being torn down, you think, 'They're going to fill up a whole landfill with that,'" said Matthew Malone, 13. In Prince George's County, Suitland Elementary has been so successful that another green school is being planned, in Laurel, for the 2008-09 school year. At Suitland, a garden courtyard collects and uses rainwater; the roof is angled away from the sun to keep it cool; and skylights and tall windows let in lots of natural light. "You don't have to switch on the light switch all the time," said Rupert McCave, the county official guiding these projects. Green schools tend to be sunnier and more _ than older buildings. In fact, a study done inprefix = st1 /Washingtonstate showed that students at green schools performed better and were absent less. Question: The passage is mainly about_. - green buildings - successful schools - students going green - environmentally-friendly schools
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environmentally-friendly schools