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The changes in globally averaged temperature that have occurred at the Earth’s surface over the past century are similar in size and timing to those(1)by models that take into account the combined influences of human factors and solar variability. To (2) the question of attribution requires the (3) of more powerful and complex methods beyond the use of global averages alone. New studies have focused on(4) maps or patterns of temperature change in (5) and in models. Pattern analysis is the climatologically equivalent of the more comprehensive tests in the medical analogy mentioned(6), and makes it possible to achieve more definitive(7)of the observed climate changes to a particular cause or causes.The expected influence of human activities is thought to be much more complex than uniform warming over the entire surface of the Earth and over the whole(8) cycle. Patterns of change over space and time therefore provide a more powerful (9) technique. The basic idea(10)pattern-based approaches is that different(11)causes of climate change have different characteristic patterns of climate response or fingerprints. Attribution studies seek to(12) a fingerprint match between the patterns of climate change(13) by models and those actually observed.The most recent assessment of the science suggests that human activities have led to a discernible (14)on global climate and that these activities will have an increasing influence on future climate. The burning of coal, oil and natural gas, as well as various agricultural and industrial practices, are(15)the composition of the atmosphere and contributing to climate change. These human activities have led to increased atmospheric (16) of a number of greenhouse gases, including carbon dioxide, methane and so on in the lower atmosphere.Human activities, such as the burning of fossil, have also increased the (17) of small particles in the atmosphere. These particles can change the(18) of energy that is absorbed and reflected by the atmosphere. They are also believed to modify the(19) of air and clouds, changing the amount of energy that they absorb and reflect. Intensive studies of the climatic effects of these particles began only recently and the overall(20)is uncertain. It is likely that the net effect of these small particles is to cool the climate and to partially offset the warming of increasing concentrations of greenhouse gases.

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The difference between avian flu and human flu that should be commanding our rapt attention today is that avian influenza, specifically the H5N1 strain known as bird flu, threatens to become the young people’s plague. And it is a growing contender to cause a devastating worldwide pandemic in the next few years.We are too used to thinking of flu as an annual annoyance that kills only the frail and elderly. But that just isn’t the case for H5N1. With a mortality rate of over 50 percent, this bird flu has killed over 110 people, striking the young and able-bodied the hardest. Its victims cluster predominantly among 5- to-30-year-old, a pattern that has held up in the 34 known to have died from bird flu so far this year.This vulnerability may stem from the robust and fast-responding immune systems of the young. The victims overreact to the alien virus, triggering a massive immune response called a cytokine storm, turning healthy lungs into a sodden mass of dying tissues congested with blood, toxic fluid, and rampaging inflammatory cells. As air spaces choke off, the body loses oxygen and other organs fail.Scientists have recently shown that H5N1 has ominous parallels with the devastating 1918 flu pandemic, which also jumped directly to humans from birds and disproportionately attacked the young and the strong. With a pattern highly suggestive of a cytokine storm, death sometimes came within just hours, turning many World War I troop ships into death ships.Now imagine hundreds of thousands of young people laboring on respirators, or lying alone in corridors and makeshift hospital rooms, too sick to be helped when the supply of beds, equipment, and trained staff run out. Seem like hype? Not to the medical experts who discussed these scenarios during last week’s t/. 5*. News Health Summit on emergency preparedness.This picture puts a face on the U. S. Department of Health and Human Services, projections that, ifH5N1 mutates into a readily human-transmissible from 209, 000 to 1.9 million Americans could die. Part of our readiness thinking should be to heed the blunt words of HHS Secretary Michael Leavitt at the summit: Any family or community that fails to prepare for the worst, with the expectation that the federal or state government will come to the rescue, will be “tragically wrong.” In a pandemic, the government’s medical resources will be stretched thin, and it won’t be able to guarantee first-line help to any hometown, local hospital, or college campus. Even the national stockpile of Tamiflu, the antiviral that is the best we have to prevent or lessen the impact of the illness, has its limits. If a college student is hospitalized with a possible H5N1 infection, the feds will provide drugs. But they will not make it available to fend off the virus in the many others who may have come in close contact with the infected student. In the existing federal guidance on H5N1, the young and healthy fall into the lowest-priority group for antiviral drugs and vaccines. Student health centers or other providers had better scrounge up their own stockpiles. Containing possible outbreaks on college campuses may be all but impossible. Social distancing — avoiding close contact with other people with air kisses instead of smooches, or even by donning masks and gloves — will be tough to enforce.The threat poses a uniquely difficult challenge. In the best of all scenarios, the virus will lose its fury and leave in its wake a new culture of individual and community preparedness. But we need to get ready now, and not for the best scenario but for the worst.1.The difference between avian flu and human flu is that(  ) .2.The reason that bird flu strikes the young and able-bodied the hardest may be(   ) .3.According to the author, which is the best source that college students can rely upon if there are outbreaks of bird flu on college campuses?4.We can learn from the passage that(  ) .

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In a year marked by uncertainty and upheaval, officials at New Orleans universities that draw applicants nationwide are not following the usual rules of thumb when it comes to college admissions. The only sure bet, they say, is that this fall’s entering classes — the first since Katrina 一 will be smaller than usual.In typical years, most college admissions officials can predict fairly accurately by this point in the admissions cycle how many high school seniors will commit to enrolling in their institutions. Many of the most selective schools require students—who increasingly are applying to multiple institutions — to make their choices by May 1. Loyola University, whose trustees will vote May 19 on whether to drop several degree programs and eliminate 17 faculty positions, received fewer applications — about 2, 900 to date, compared with 3, 500 in recent years. The school hopes to enroll 700 freshmen, down from 850 in the past few years. Historically black Dillard University, which is operating out of a hotel and was forced to cancel its annual March open house, also saw drops, as did Xavier University, a historically black Catholic institution that fell behind its recruitment schedule. Dillard won’t release numbers, but spokeswoman Maureen Larkins says applications were down and enrollments are expected to be lower than in the past. Xavier admissions dean Winston Brown says its applicant pool fell by about half of last year’s record 1, 014; he hopes to enroll 500 freshmen.In contrast, Tulane University, which is the most selective of the four and developed an aggressive recruitment schedule after the hurricane, enjoyed an 11% increase in applications this year, to a record 20, 715. Even so, officials predict that fewer admitted students will enroll and are projecting a smaller-than-usual freshman class — 1, 400, compared with a more typical 1, 600. Tulane officials announced in December that they would eliminate some departments and faculty positions.Like Tulane, other schools are taking extra steps this year to woo admitted students, often by enlisting help from alumni around the country and reaching out to students with more e-mails, phone calls or Web-based interactions such as blogs. In addition, Loyola is relaxing deadlines, sweetening the pot with larger scholarships and freezing tuition at last year’s level. Dillard, too, is freezing tuition. It’s also hosting town meetings in target cities and regions nationwide, and moved its academic calendar back from August to mid-September “to avert the majority of the hurricane season,’’ Larkins says. Xavier extended its application deadline and stepped up its one-on-one contact with accepted students. And Tulane, among other things, has doubled the number of on-campus programs for accepted students and hosted a community service weekend program.While the schools expect applicants to be apprehensive, the admissions officials also see encouraging signs of purposefulness among applicants. “A lot of students who are choosing to come to this city (are) saying, ‘I want to be a part of (the action)'", says Stieffel, noting that Loyola’s transfer applications were up 30%. And while applications to Xavier are down, Brown is betting that students who do apply are serious. “The ones who are applying, we feel, are more likely to come,” he says.1. It can be inferred from the passage that(  ) .2.The following statements are false other than (  ).3.In order to attract applicants, Loyola University and Dillard University are(  ) .4.The passage mainly concentrates on the subject of(  ) .

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The terrorist attacks in London Thursday served as a jarring reminder that in today’s world, you never know what you might see when you pick up the newspaper or turn on the TV. Disturbing images of terror can trigger a visceral response no matter how close or far away from home the event happened.Throughout history, every military conflict has involved psychological warfare in one way or another as the enemy sought to break the morale of their opponent. But thanks to advances in technology, the popularity of the Internet, and proliferation of news coverage, the rules of engagement in this type of mental battle have changed.Whether it’s a massive attack or a single horrific act, the effects of psychological warfare aren’t limited to the physical damage inflicted. Instead, the goal of these attacks is to instill a sense of fear that is much greater than the actual threat itself.Therefore, the impact of psychological terror depends largely on how the acts are publicized and interpreted. But that also means there are ways to defend yourself and your loved ones by putting these fears into perspective and protecting your children from horrific images.What Is Psychological Terror? "The use of terrorism as a tactic is predicated upon inducing a climate of fear that is incommensurate with the actual threaten," says Middle Eastern historian Richard Bulliet of Columbia University. “Every time you have an act of violence, publicizing that violence becomes an important part of the act itself.”“There are various ways to have your impact. You can have your impact by the magnitude of what you do, by the symbolic character of target, or the horrific quality of what you do to a single person ” Bulliet tells WebMD. “The point is that it isn’t what you do, but it’s how it’s covered that determines the effect.” For example, Bulliet says the Iranian hostage crisis, which began in 1979 and lasted for 444 days, was actually one of the most harmless things that happened in the Middle East in the last 25 years. All of the U. S. hostages were eventually released unharmed,but the event remains a psychological scar for many Americans who watched helplessly as each evening’s newscast counted the days the hostages were being held captive.Bulliet says terrorists frequently exploit images of a group of masked individuals exerting total power over their captives to send the message that the act is a collective demonstration of the group’s power rather than an individual criminal act. “You don’t have the notion that a certain person has taken a hostage. It’s an image of group power, and the force becomes generalized rather than personalized,” says Bulliet. “ The randomness and the ubiquity of the threat give the impression of vastly greater capacities. ’’Psychiatrist Ansar Haroun, who served in the U. S. Army Reserves in the first Gulf War and more recently in Afghanistan, says that terrorist groups often resort to psychological warfare because it’s the only tactic they have available to them. “They don’t have M-16s, and we have M-16s. They don’t have the mighty military power that we have, and they only have access to things like kidnapping," says Haroun, who is also a clinical professor of psychiatry at the University of California, San Diego.“In psychological warfare, even one beheading can have the psychological impact that might be associated with killing 1,000 of the enemy," Haroun tells WebM D. “You haven’t really harmed the enemy very much by killing one person on the other side. But in terms of inspiring fear, anxiety, terror, and making us all feel bad, you’ve achieved a lot of demoralization."1.Which of the following statements is NOT among the reasons that change the rules of psychological warfare?(  )2.According to Richard Bulliet, why does "publicizing an act of violence becomes an important part of terrorism itself”?(  )3.The Iranian hostage crisis shows that(  ) .4.The randomness and the ubiquity of the terrorist acts bring to the public the impression that(  ).

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The collapse of the Earth’s magnetic field — which guards the planet and guides many of its creatures — appears to have started seriously about 150 years ago, the New York Times reported last week.The field’s strength has decreased by 10 or 15 percent so far and this has increased the debate over whether it signals a reversal of the planet’s lines of magnetic force.During a reversal, the main field weakens, almost vanishes, and reappears with opposite polarity (极).The transition would take thousands of years. Once completed, compass needles that had pointed north would point south. A reversal could cause problems for both man and animals. Astronauts and satellites would have difficulties. Birds, fish and animals that rely on the magnetic field for navigation would find migration confusing. But experts said the effects would not be a big disaster, despite claims of doom and vague evidence of links between past field reversals and species extinctions.Although a total transition may be hundreds or thousands of years away, the rapid decline in magnetic strength is already affecting satellites. Last month, the European Space Agency approved the world’s largest effort at tracking the field’s shifts. A group of new satellites, called Swarm, is to monitor the collapsing field with far greater precision. “ We want to get some idea of how this would evolve in the near future, just like people trying to predict the weather,” said Gauthier Hulot, a French geophysicist working on the satellite plan. “I’m personally quite convinced we should be able to work out the first predictions by the end of the mission. ’’No matter what the new findings, the public has no reason to panic. Even if a transition is coming on its way, it might take 2, 000 years to mature. The last one took place 780,000 years ago, when early humans were learning how to make stone tools. Deep inside the Earth flow hot currents of melted iron. This mechanical energy creates electromagnetism. This process is known as the geophysical generator. In a car’s generator, the same principle turns mechanical energy into electricity.No one knows precisely why the field periodically reverses. But scientists say the responsibility probably lies with changes in the disorderly flows of melted iron, which they see as similar to the gases that make up the clouds of Jupiter.1.According to the passage, the Earth’s magnetic field has(  ) .2.During the transition of the Earth’s magnetic field (  ).3.The author says the public has no reason to panic” because(  ) .4.The cause of the transition of the Earth’s magnetic field comes from(  ) .

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There are over 6, 000 different computer and online games in the world now. A segment of them are considered to be both educational and harmlessly entertaining. One such game teaches geography, and another trains pilots. Others train the player in logical thinking and problem solving. Some games may also help young people to become more computer literate, which is more important in this technology-driven era.But the dark side of the computer games has become more and more obvious. “A segment of games features anti-social themes of violence, sex and crude language,” says David Walsh, president of the National Institute on Media and Family. “Unfortunately, it’s a segment that seems particularly popular with kids aged eight to fifteen.”One study showed that almost 80 percent of the computer and online games young people preferred contained violence. The investigators said, “These are not just games anymore. These are learning machines. We’re teaching kids in the most incredible manner what it’s like to pull the trigger. What they are not learning are the real-life consequences. ’’They also said, "The new and more sophisticated games are even worse, because they have better graphics and allow the player to participate in even more realistic violent acts. ” In the game Carmageddon, for example, the player will have driven over and killed up to 33, 000 people by the time all levels are completed. A description of the outcome of the game says: “Your victims not only squish under your tires and splatter blood on the windshield. They also get on their knees and beg for mercy, or commit suicide. If you like, you can also dismember them. ”Is all this simulated violence harmful? Approximately 3, 000 different studies have been conducted on this subject. Many have suggested that there is a connection between violence in games and increased aggressiveness in the players.Some specialists downplay the influence of the games, saying that other factors must be taken into consideration, such as the possibility that kids who already have violent tendencies are choosing such games. But could it be that violent games still play a contributing role? It seems unrealistic to insist that people are not influenced by what they see. If that were true, why would the commercial world spend billions of dollars annually for television advertising?1.Which of the following computer games are NOT mentioned as educational and harmlessly entertaining?(  )2.According to the investigators,(  ).3.It can be inferred from the passage that (  ). 4.The author uses “television advertising” as an example to show that (  ).

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