Ques:Read the following article and select the best answer. Article: Special trees that grow faster, fight pollution, produce better wood, and even sense chemical attacks are being planted by scientists in the US. When 40 per cent of Hawaii's US$14 million-a-year papaya industry was destroyed by a virus five years ago, work began on creating genetically engineered trees. Researchers successfully introduced seeds that were designed to resist the virus.Since then, more and more people have been testing genetically engineered trees.Some researchers put special bacteria into trees to help them grow faster and produce better wood.Others are trying to create trees that can clean polluted soil.Meanwhile fruit farmers are looking for trees that are strong enough to resist worms, and paper companies want trees that produce more wood and therefore more paper. The Pentagon even gave the researchers US$500,000 this year after they developed a pine tree that changes its colours if it senses a chemical attack.So far, the poplar, eucalyptus , apple and coffee trees are among those being engineered.All this can be done today because we have a better understanding of tree genomes . However, some people fear that the genetically engineered trees will cause dangerous results.They are worried that the new trees will breed with natural species and change the balance of the forest environment. "It could be destructive," said Jim Diamond, an environmentalist. "Trees are what is left of our natural environment and home to many endangered species." But researchers insist that science could give nature a fighting chance against both natural and man-made dangers.They hope to answer the critics by stopping the new trees from breeding, so their effect on the environment can be controlled. Question: Why did critics think engineered trees dangerous? Because _ . - these trees can destroy the balance of nature - everything except trees has been genetically engineered - trees are home to many endangered species - these trees may affect normal trees

Ans:these trees may affect normal trees
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Ques:Read the following article and select the best answer. Article: Is any economist so dull as to criticise Christmas? At first glance,the holiday season in western economies seems a treat for those concerned with such vagaries as GDP growth.After all,everyone is spending;in America,retailers make 25% of their yearly sales and 60% of their profits between Thanksgiving and Christmas.Even so,economiwsts find something to worry about in the nature of the purchases being made. Much of the holiday spending is on gifts for others.At the simplest level,giving gifts involves the giver thinking of something that the recipient would like-he tries to guess her preferences,as economists say-and then buying the gift and delivering it.Yet this guessing of preferences is not easy;indeed,it is often done badly.Every year,ties go unworn and books unread.And even if a gift is enjoyed,it may not be what the recipient would have bought if they had spent the money themselves. Interested in this mismatch between wants and gifts,in 1993 Joel Waldfogel,then an economist at Yale University,sought to estimate the difference in dollar terms.In a research,he asked students two questions at the end of a holiday season:first,estimate the total amount paid (by the givers) for all the holiday gifts you received;second,apart from the sentimental value of the items,if you did not have them,how much would you be willing to pay to get them? His results were gloomy:on average,a gift was valued by the recipient well below the price paid by the giver. In addition,recipients may not know their own preferences very well.Some of the best gifts,after all,are unexpected items that you would never have thought of buying,but which turn out to be especially well picked.And preference can change.So by giving a jazz CD,for example,the giver may be encouraging the recipient to enjoy something that was ignored before.This,a desire to build skills,is possibly the hope held by many parents who ignore their children's desires for video games and buy them books instead. Finally,there are items that a recipient would like to... Question: The text is most likely taken from a _ . - users' handbook - medical journal - travel magazine - consumer-related report

Ans:consumer-related report
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Ques:Read the following article and select the best answer. Article: In the early days of the Internet, the idea that it represented an entirely new and separate field distinct from the real world was seized upon by both supporters and critics of the new technology.Supporters liked the idea that the virtual world was a placeless datasphere, liberated from constraints and restrictions of the real world, and an opportunity for a fresh start.For instance, John Perry Barlow, an internet activist, issued the "Declaration of the Independence of Cyberspace" in February 1996.He thundered, "Governments of the industrial world, I come from cyberspace, the new home of mind.Cyberspace does not lie within your borders.We are creating a world that all may enter without privilege or prejudice accorded by race, economic power, military force, or station of birth. Where Mr.Barlow found the separation between the real and virtual worlds exciting, however, critics regarded it as a cause for concern.They worried that people were spending too much time online, communicating with people they had never even met in person in chat rooms, virtual game worlds and, more recently, on social - networking sites such as MySpace and Facebook.A study carried out by the Stanford Institute for the Quantitative Study of Society in 2000, for example, found that heavy internet users spent less time talking to friends and family, and warned that the Internet could be "the ultimate isolating( ) technology". Both groups were wrong, of course.The Internet has not turned out to be a thing apart.Unpleasant aspects of the real world, such as taxes, crime and cheating are now characteristics of the virtual world, too.C'amers who make real money selling swords, gold and other things in virtual game worlds may now find that the tax man wants to know about it.Designers of virtual objects in Second Life, an online virtual world, are seeking to real -world lawsuits in order to protect their intellectual property. At the same time, however, some of the most exciting uses of the Internet rely on combining it with the real... Question: From the passage we can conclude that the author _ . - believes the real and virtual worlds rely on each other - argues that real and virtual worlds are not consistent - agrees with both supporters and critics of the Internet - opposes the combination of the Internet and the physical world

Ans:
believes the real and virtual worlds rely on each other
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