单选题[此试题无题干]

单选题[此试题无题干]

单选题From the first paragraph we know that ______.

单选题Whatdoestheexpression"Whereisthebeef"mean?A.Thebeefislost.B.Somethingisnotasgoodasdescribed.C.Thebeefisnotasgoodasitissaidtobe.D.Thefoodhasturnedbad.

单选题CHICAGO-Thefactthatanobscurescientistcouldbecomeaninstantmediacelebritybyannouncinghewasreadytocreateahumancloneshowsthedegreetowhichtheissuefascinatesandscareshumankind,expertssaidlastweek."It'snotafearofsciencebutofhowtocontrolthetechnology-"andthatgoesbackinfictiontoFrankenstein,"saidAnneFigert,aprofessorintheanthropologyandsociologydepartmentatLoyolaUniversityofChicago."Weweren'tupsetabout(cloning)animals,"sheadded."It'sthesamereasonwe'reconcernedaboutabortionorusingreproductivetechnologies.Twentyyearsagoitwastesttubebabies-ittreadssocloselytohumanlifeitself."Theideaalsohasanirresistiblepullbecauseittouchesonacentralthemethroughoutcivilization:Thesearchforimmortality,addedKennethHoward,aprofessorofpsychologyatNorthwesternUniversityinChicago.Butthosesearchingforafountainofyouth,hesaid,overlookthefactthatthehumanduplicatewouldreturnasaninfant."Everyoneseemstobelievethatyou'djustbeayoungerversionofwhoyouaretodayandcoulduseallyourexperienceandshapeyourlifebecauseyounowknowbetter,"Howardsaid."Buttherealityisthatyou'dgothroughanotherlifeanditwouldn'tbeyou."RichardSeed,aHarvard-educatedphysicist,reignitedthedebatethatbeganlastyearwhenresearchersinScotlandclonedasheepnamedDollybysayinghewasreadytodothesametoahuman.Itcouldhappen,hesaid,within18monthsprovidedhecangetfinancialbacking,withhisfirstservicebeingclonedbabiesforinfertilecouples.WithinhoursSeedwascondemnedbytheWhiteHouseandattackedintheUSCongress.HealsorodeawaveofmediapublicitythatputhimonABC-TV's"Nightline"lastweekwhereheevenofferedtoclonehostTedKoppel.TheUniversityofIllinoisatChicagosaidthe69-year-oldSeedhadusedspacethereforthreeyearstodosmall-scaleexperimentsontheimmunesystemsofmice.Hisspacehadneitheradesknorafilecabinet.AuniversityspokesmansaidSeedhadpublishedmorethan20scientificpapersincludinga1994articleintheJournaloftheAmericanMedicalAssociation.Hewasalsoinvolvedinhumanembryotransplantresearch20yearsago.TheChicagoTribunereportedthatheisbroke,andwasevictedfromahomelastJulyafterthebankforeclosedonaUS330,000loanfornonpaymentoftaxes.Theattracitonofhumancloningisreflectedinthepopularityofsciencefictionworkswhichhavelongminedthesubject.Seedhasspokenofextendinghumanlifeindefinitelynotthroughcopiesbutbygeneticmanipulationthatwouldimproveimmunesystemsandfightdiseases.AllanColeco-authoredtheeight-volume"Sten"seriesthatfeaturedan"eternalemperor"whousedclonestoreplacehimself,enablinghimtoruleforseveralthousandyears."Theonlyuseforcloningwouldbeforpeopletorecreatethemselves,andyou'dhavetobeamegalomaniactodothat,"Colesaid."It'slikesplittingtheatom.Technologyisneithergoodnorevil.It'sjusttheuseofit,hesaid."Ultimately,someone'sgoingtomisuseit.

单选题Many people who fly at least occasionally have come down with a cold or the flu shortly after disembarking. Is the air in airborne commercial jets (21) ? The Association of Flight Attendants (AFA), (22) which 42000 flight attendants with 27 airlines are represented, evidently thinks so. The organization claims that the incidence of air-quality-related diseases has (23) among its members and demands that prompt actions be (24) to improve the conditions in the airplane cabin. A study the AFA (25) in 1997 uncovered about 1000 self-reported incidents of headaches, dizziness and memory loss (26) flight attendants and passengers. Some flight attendants were too ill to (27) their safety duties, while others have been permanently disabled. Because of airlines' efforts to (28) their expenses, cabin-air filters are not cleaned (29) . The complaints of flight attendants do not always give (30) to correct maintenance. Airlines turned to recycled air, (31) that they would reduce some of their costs. They are not required to put filters in. Airlines are (32) great pressure to get their flights out (33) . So they do not pay as much attention to systems that are not as (34) to flight schedule and safety. Recent research findings emphasize the concern that filters can (35) engine chemicals into the cabin air. This may not happen (36) every flight, but it is a persistent problem. In a study published in October 1998, an investigation was made (37) complaints of crew members (38) air quality and health. More than half of the 200 subjects reported health problems which they (39) to cabin air. It was concluded that these health problems were consistent with (40) harmful gases and substances.

单选题The future of space exploration depends on many things. It depends on how technology evolves, how political forces shape competition and partnerships between nations, and how important the public feels space exploration is. The near future will see the continuation of human space flight in Earth"s orbit and unpiloted space flight within the solar system. Piloted space flight to other planets, or even back to the moon, still seems far away. Any flight to other solar systems is even more distant, but a huge advance in space technology could drive space exploration into realms currently explored only by science fiction. The 1968 film 2001: A Space Odyssey depicted commercial shuttles flying to and from a giant wheel-shaped space station in orbit around Earth, bases on the moon, and a piloted mission to Jupiter. The real space activities of 2001 will not match this cinematic vision, but the 21st century will see a continuation of efforts to transform humanity into a spacefaring species. Perhaps the most difficult problem space planners face is how to finance a vigorous program of piloted space exploration, in Earth"s orbit and beyond. In 1998 no single government or international enterprise had plans to send people back to the moon, much less to Mars. Such missions are unlikely to happen until the perceived value exceeds their cost. One belief shared by a number of space exploration experts is that future lunar and Martian expeditions should be aimed at creating permanent settlements. The residents of such outposts would have to "live off the land," obtaining such necessities as oxygen and water from the harsh environment. On the moon, pioneers could obtain oxygen by heating lunar soil. In 1998 the Lunar Prospector discovered evidence of significant deposits of ice, a valuable resource for settlers, mixed with soil at the lunar poles. On Mars, oxygen could be extracted from the atmosphere and water could come from buried deposits of ice. The future of piloted lunar and planetary exploration remains largely unknown. Most space exploration scientists believe that people will be on the moon and Mars by the middle of the 21st century, but how they get there, and the nature of their visits, is a subject of continuing debate. Clearly, key advances will need to be made in lowering the cost of getting people off Earth, the first step in any human voyage to other worlds.

单选题Questions 17～20 are based on the following report about human height. You now have 20 seconds to read Questions 17～20.

单选题What is the most remarkable characteristic of Modem English?

单选题Everyone knows that the world has too many people. But how many people are too many? By what standard is the Earth overpopulated? Certainly not in terms of living space. The world's entire population could fit into Jacksonville, Florida, in the USA, with everyone having standing room. Dense cities often are surrounded by nearly empty countryside. For overpopulation to be real, there must be conditions that are undesirable and unmistakably caused by the presence of a certain number of people. If such indications cannot be found, we are entitled to dismiss the claim of overpopulation. In arguing their case, believers in overpopulation make references to a vague standard known as "carrying capacity", colorfully illustrated with stories about bacteria and herds of zebras (anything but human beings). Famine, deepening poverty, disease, environmental degradation and resource depletion. Yet on no account is there evidence to support the claim of overpopulation. In fact, during the 20th century there has been no famine that has not been caused by wars, irrational economic policies or natural disasters. Food is abundant and is becoming cheaper and more plentiful. That good news is due largely to technological advances (the "green revolution") that have provided better seeds, fertilizers, pesticides and methods of farming. The only obstacles to agricultural progress are those created by governments. Imagine what the world would be like today if the fertile farmland of India or Russia had been in productive private hands operating in free markets for the past several decades. Since permitting market incentives in agriculture, India has become a net food exporter and China has experienced a boom in agricultural production. Catastrophists argue that the bright past does not imply a bright future; they assert that mankind has crossed some fateful threshold. Those who annually predict imminent famine seize on any change as evidence that man's alleged strain on the environment is finally beginning to show. Thus, if the price of seafood rises, they announce that the seas are nearing exhaustion. They never consider the more plausible possibilities, such as the shift in diet from meat to fish, the decline of the Russian industry during the political break-up of the Soviet Union, or the lack of property rights in the world's oceans and lakes.

单选题The initial impact of computers was in the area of entertainment. If you walked by a video arcade in the early 1980s, you could not have failed to notice that the use of video games was growing at what some considered an alarming rate. In 1981 the movie industry grossed $ 3 billion, video games took in an estimated $ 6 billion. That gives you some idea of just how big the computer industry had become. Video games employ the same technology as personal computers, and indeed many who bought personal computers did so primarily for playing games at home, thus saving their quarters. Though video games are not as popular as they were a few years ago, they did provide consumers with their first real reason to buy PCs. A more recent computer innovation, desktop publishing, supplies one good reason for those who write for a living to buy a PC. Desktop publishing is a deceptively simple description for an extremely complex group of hardware and software tools. You can now write text, edit text, draw illustrations, incorporate photographs, design page layouts, and print a finished document with a relatively inexpensive computer and laser printer. Although the new technology offers new freedom, there is a price to be paid for this freedom. With total control comes total responsibility. In fact, the issue of social responsibility in our new computer age has long been a topic of debate among computer enthusiasts. Some people are concerned with the long-term social effects of the so-called computer revolution. Ironically, many PC pioneers who built and marketed the first machines were 60s-style advocates of social change. They claim that while personal computer technology has the potential to make society more equal, it's having the opposite effect since upper-middle-class people can afford them and lower-class people cannot. In addition, the ways that computers are used to monitor the activities of their users have evoked anxiety about the machines. Over 7 million Americans now have their work paced, controlled, and monitored by computers. A computer is more restrictive and powerful in the way it controls people than the old-fashioned assembly line. This can lead to what some have called "tech-stress". Irritated eyes, back problems, and other physical symptoms have also been associated with the extensive use of computers. Although the personal computer may not have had the impact some predicted a decade age, the combination of computer technology with satellites and cable does promise innovations in the mass media that would have seemed astonishing just a few short years ago.

单选题I just wonder ______ makes her so sentimental, A. why it does B. what he does C. how it is D. what it is

单选题What the Chicago public schools prefers to in language education is ______.

单选题Which of the following is the official national anthem of the U.S. ?

单选题 {{I}}Questions 18-20 are based on a professor's lecture about how to avoid plagiarism. You now have 15 seconds to read Questions 18-20.{{/I}}