Read the following article and select the best answer. Article: Once again, rumors are spreading. Judgment Day, this time, is set to happen on December 21st, 2012. The date originated from the Mayan calendar, but actually gained popularity through the hit movie, "2012". How will the world end? And how do we know the exact date? There are many theories: A meteoroid from outer space; a solar storm; a shift in the earth's poles; bla bla bla. They all supposedly pointed to the date of December 21st, 2012. Unfortunately, none of it is true. Zhu Jin, director of Beijing Planetarium, said, "For earth itself, the end will be billions of years away from now.And for us humans, there is a very small chance that we may be affected by some astronomical factors.However, we don't have the ability to foresee such events so far.So when someone tells you the world is going to end on an exact date, it must be fake." But the truth hasn't stopped people from believing. In the sci-fi movie "2012", the director imagined the end of the world based on the Mayan calendar. The film earned nearly 770 million US dollars worldwide. Ning Hong, Hebei Province, said. "The movie 2012 did get one thing right. There are arks being made in China, But they're not being built secretly inside the mountains.They are constructed here in the courtyard of a factory." In April, Liu Qiyuan quit his furniture business and devoted himself to developing these huge round balls. He doesn't believe the end is near, but he wants to be prepared just in case. Liu Qiyuan, the "Ark" builder, said, "The concept originated twenty years ago. The Tangshan earthquake had flattened our house, so I wanted to build a shelter that wouldn't fall. Then in 2004, I saw the tsunami in Indonesia that killed so many people.Then I realized it should be something that could withstand the earthquake and float on water." Liu is hoping to use his invention as a life boat on the sea.He's planning to test his product on the water next year. It turns out that rumor, though false, is good for business. Doomsday discounts and products are hot on... Question: Liu Qiyuan quit his job and built his "ark" because _ . - he wanted to make preparations for destructive natural disasters - he was tired of making money from his furniture business - he was almost killed in Indonesia in 2004 - he believed that the world was going to end on Dec. 21, 2012
he wanted to make preparations for destructive natural disasters

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Read the following article and select the best answer. Article: DNA tells the story of the race to discover the structure of DNA, and the scientists who changed our understanding of the world and everything in it. The five-part series, to be broadcast from Thursday July 14 at 8:30 p.m. on ABC TV, also looks at the scientists' work for the future of mankind. The scientists were a small group of pioneers who explored a world too small to see. What they found there answered some eternal questions--What is life? How is it made ? Why are children like their parents? DNA is without doubt the most powerful substance on earth. The order of its chemicals determines whether a child has her mother's eyes or her father's smile. But as DNA shows, until 50 years ago, almost no one knew of its existence. All that changed when two unknown scientists - Jim Watson and Francis Crick -ran into a pub in Cambridge shouting that they'd found the secret of life. This declaration heralded a momentous discovery, not just for the human race but for the people involved. As this program shows, it was one of the most heated scientific races the world has ever seen. Dr Watson takes us back 50 years, guiding us through the tumultuous events that led to the creation of a double helix model being built by Dr Francis Crick and himself. He tells how he and Crick try hard to find the double helix first and win the Noble Prize. The program shows others involved with the DNA story, including Maurice Wilkins, who helped create the atom bomb. He became disillusioned with the science of death and chose the science of life instead, by looking for the structure of DNA. Question: The purpose in writing this text is to _ . - introduce some scientists - report on a study on DNA - tell the importance of DNA - give a TV program summary
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give a TV program summary

Read the following article and select the best answer. Article: Full face transplants are no longer science fiction fantasy, a leading surgeon has said, adding that they are technically feasible but ethically complex. Peter Butler from London's Royal Free Hospital called for a debate on the ethics of such an operation made possible by new drugs whichstop the body's immune system rejecting a transplanted face. "It is not 'Can we do it?' but 'Should we do it?'" he told the BBC."The technical part is not complex, but I don't think that's going to be the very great difficulty. The ethical and moral debate is obviously going to have to take place before the first facial transplantation." The British Association of Plastic Surgeons will discuss the microsurgical procedure , which could give new skin, bone, noses, chin, lips and ears from _ donors to patients disfigured by accidents, burns or cancer. But surgeons could have trouble finding enough willing donors. prefix = st1 /Butlersaid his survey of doctors, nurses and members of the public showed most would accept a face transplant but few were willing to donate their own after dying. Despite a number of ethical concerns, Christine Piff, who founded the charity Let's Face It after suffering a rare facial cancer 25 years ago, welcomed the possibility of face transplants. She rejected the idea that the procedure would mean people would end up living with a dead person's face. "There are so many people without faces, I have half a face... but we are all so much more than just a face... you don't take on their personality. You are still you," she told reporters. "If we can donate other organs of the body, then why not the face? I can't see anything wrong with it." Question: According to the passage, what makes it possible to carry out a facial transplantation? - Drugs are available to stop the body's immune system rejecting a transplanted face. - It's morally practical, though technically complex. - Most people accept the idea of face transplants. - There are some people who are willing to donate their faces after dying.
Drugs are available to stop the body's immune system rejecting a transplanted face.