单选题The minister ______ the latest crime figures as proof of the need for more police.

单选题Martin asked his professor for some comments on his report but it was ______.

单选题Although economists have traditionally considered the district to be solely an agricultural one, the ______ of the inhabitants' occupations makes such a classification obsolete.

单选题{{B}}Passage Five{{/B}} As students return to school this fall, parents will again worry about new illnesses as kids come into contact with flu germs. There are other risks they should worry about—illnesses caused by the common bugs and rodents found in school buildings. Perhaps the even more dangerous pests however are those individuals who prevent school administrators from swiftly addressing these problems. Anti-chemical activists have pushed, and nearly 20 states and local governments have passed, 1 aws to eliminate or drastically reduce the use of pesticides in schools. Yet pesticides are used to control roaches, mice, rats, mosquitoes, and other pests. The public health implications of allowing these things to get out of control should be obvious: increased allergies and illnesses related to insect and rodent bites. Some states have passed a seemingly more reasonable policy that demands that school administrators provide notification 48 to 72 hours before using pesticides. But such laws allow problems to escalate during wailing periods when an urgent response is warranted. Notification paperwork burdens also consume limited financial resources. Journalist Steve Milloy reported that the notification law of Maryland costs the state's schools $32.000 annually. Parents should fear these laws and the pests they harbor more than the pesticides. Environmental Protection Agency (EPA) pesticide standards are so exceedingly cautious that the risks are tiny when the product is used according to label directions. An analysis done by the University of Texas found that the EPA's risk estimates overstate pesticide exposure damage at a level hundreds of thousands of times greater than the risk of actual exposure. Meanwhile, many of the pests in schools pose serious risks. Allergies and asthma are a particular concern. According to one study published in Environmental Health Perspectives: "Allergens associated with dust mites and cockroaches are probably important in both onset and worsening of asthma symptoms for children who are chronically exposed to these agents." Cockroach allergies are particularly problematic. Children who suffered from this type of allergy missed more days of school and lost more sleep than children suffering from other allergies. Prudent use of chemicals—not reduced pesticide use—can be a big part of the solution. A study in the Journal of Allergies and Clinical Immunology showed that use of chemical baits and regular cleaning can reduce indoor cockroach allergens to levels below that which causes allergies. If people are truly concerned about public health in schools, it's time to start looking at priorities. Rather than liberate the pests, they should liberate the schools from silly government regulations and dangerous vermin.

单选题Colour-blind people often find it difficult to ______ between blue and green. (2003年西南财经大学考博试题)

单选题Which of the following types of ethnic cultural expression is discussed in the passage?

单选题We can conclude from the passage that ______.

单选题The recent economic crisis has brought about a______in world trade.

单选题Already lasers can obliterate skin blemishes, topically applied drugs can smooth facial lines and injected agents can remove deep wrinkles. Future products will be faster, better and longer lasting. "New substances will be developed by entrepreneurs," says Brian Mayou, an aesthetic plastic surgeon, "that will be more successful than liquid silicone that we use today to eradicate wrinkles." The next major breakthrough, says Mel Braham, plastic surgeon and chief executive of the Harley Medical Group, will be laser treatment that needs no recovery period. Nicholas Lowe, clinical professor of dermatology at the University of Los Angeles, adds: "There will be more efficient anti-oxidants to help reduce sun damage and aging. There will also be substances that increase the production of new collagen and elastic tissue to maintain the elasticity of youthful skin." Lee Shreider, a research cosmetic chemist, says that we may be able to look better without any kind of operation as semi-permanent make-up gets better. "Crooked noses will be improved by effectively sealing on shaded colors that either enhance or subdue areas of the face. We will be able to straighten eyebrows and lips making the face more metrical—which remains one of the keys to beauty, and even close blocked pores with permanent, custom-designed foundation." The development of the safe Sun tan is a potential gold mine. Being researched at the University of Arizona, but a long way from reality, is the injectable tan. Professor Lowe is optimistic: "There will almost certainly be a safe way of developing a sunless tan that protects against sun damage. In animal research, we've applied creams to guinea pigs that can actually 'turn on' some of the genes that produce pigmentation without any sunlight exposure./

单选题It is implied in the last paragraph that in approaching socio-cultural content in a dictionary, special thought should be given to ______.

单选题Many of the students have a grasp of the main structures, a reasonable vocabulary and a(n)______idea of how to pronounce most words they come across. A. faint B. vague C. obscure D. rough

单选题Although some schools are postponing new projects because of the faltering economy, others are forging ahead with plans to emulate freshman programs that have long existed at some of the nation's oldest colleges. A. surpass B. imitate C. scramble D. expand

单选题Generation gaps are nothing new. Imperfect communication between age groups plagued the ancient Greeks and current works alike. Many an older worker chafes at an under-30 colleague who surfs the Internet, listens to his Sony Walkman and chats on the phone or with his desk mate, all while working on a project due in an hour. Sometimes, of course, he isn't corking, and that's a whole different issue. But sometimes he is getting lots of great stuff done. In the meantime, the different work styles create a case of "Would you please shut up" vs. "Lighten up. Get a life" Marc Prensky, vice president of Bankers Trust and founder of its interactive learning subsidiary, Corporate Gameware, was on point in Across the board, a publication of the conference board. The business research organization titled Prensky's article "Twitch Speed," a reference to the fast pace of video game play. Today under-30 workers likely grew up in a multimedia, technology-rich, twitch-speed environment. Prensky says they simultaneously did homework, watched TV and listened to music; this exposure changed the ways they receive and process information. Baby boomers and older workers may or may not have done homework by TV, but much else has changed. Sociologists say the over-30s are more likely to want room doors close. TV off, one thing happening at a time, quiet, please! When the two heritages clash in the workplace, it pits comfort with speed and "multitasking" against comfort with deliberation and focused concentration. Sound familiar? If the gap has become a chasm in your workplace, it's time to talk. Both work styles can be productive, but both sides need to make accommodations so the other's productivity isn't impaired.

单选题The basic causes are unknown though certain conditions that may lead to cancer have been______.

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单选题{{B}}Passage 1{{/B}} One day in 1963, a dolphin named Elvar and a famous astronomer, Carl Sagan, were playing a little game. The astronomer was visiting an institute which was looking into the way dolphins communicate with each other. He was standing at the edge of one of the tanks where several of these highly intelligent, friendly creatures were kept. Elvar had just swum up alongside him and had turned on his back. He wanted Sagan to scratch his stomach again, as the astronomer had done twice before. But this time Elvar was too deep in the water for Sagan to reach him Elvar looked up at Sagan, waiting. Then, after a minute or so, the dolphin leapt up through the water into the air and made a sound just like the word "More!" The astonished astronomer went to the director of the institute and told him about the incident. "Oh, yes. That's one of the words he knows," the director said, showing no surprise at all. Dolphins have bigger brains in proportion to their body size than humans have, and it has been known for a long time that they can make a number of sounds. What is more, these sounds seem to have different functions, such as warning each other of danger. Sound travels much faster and much further in water than it does in air. That is why the parts of the brain that deal with sound are much better developed in dolphins than in humans. But can it be said that dolphins have a "language" in the real sense of the word? Scientists don't agree on this. A language is not just a collection of sounds, or even words. A language has a structure, or what we call a grammar. The grammar of a language helps to give it meaning. For example, the two questions "Who loves Mary?" and "Who does Mary love?" mean different things. If you stop to think about it, you will see that this difference doesn't come from the words in the question but from the difference in structure. That is why the question "Can dolphins speak?" can't be answered until we find out if dolphins not only make sounds but also arrange them in ways which affect their meaning.

单选题When I was sent to prison, I really felt I had ______ my parents ______. A. let... off B. let... down C. let... out D. let... alone

单选题Fiber-optic cables can carry hundreds of telephone conversations ______.