单选题Paper or Plastic? Take a walk along the Chesapeake Bay, and you are likely to see plastic bags floating in the water. Ever since these now ubiquitous symbols of American super-consumption showed up in the supermarkets, plastic shopping bags have made their 1 into local waterways, and from there, into the bay, where they can 2 wildlife. Piles of them—the 3 takes centuries to decompose—show up in landfills and on city streets. Plastic bags also take an environmental toll in the form of millions of barrels of oil expended every year to produce them. Enter Annapolis 4 you will see plastic bags distributed free in department stores and supermarkets. Alderman Sam Shropshire has introduced a well-meaning proposal to ban retailers 5 distributing plastic shopping bags in Maryland"s capital. Instead, retailers would be required to offer bags 6 recycled paper and to sell reusable bags. The city of Baltimore is considering a similar measure. Opponents of the idea, however, argue that 7 bags are harmful, too: they cost more to make, they consume more 8 to transport, and recycling them causes more pollution than recycling plastic. The argument for depriving Annapolis residents of their plastic bags is 9 accepted. Everyone in this 10 is right about one thing: disposable shopping bags of any type are 11 , and the best outcome would be for customers to reuse bags instead. Annapolis"s mayor is investigating how to hand out free, reusable shopping bags to city residents, a proposal that can proceed regardless of whether other bags are banned. A less-expensive 12 would be to encourage retailers to give discounts to customers 13 bring their own reusable bags, a policy that a spokesman for the supermarket Giant Food says its chain already has in place. And this policy would be more 14 if stores imitated furniture mega-retailer Ikea and charged for disposable bags at the checkout counter. A broad ban on the use of plastic shopping bags, which would merely replace some forms of pollution with others, is not the 15 .

单选题Ants always put food away in Autumn. A. store B. steal C. eat D. carry

单选题We must abide by the rules.

单选题The little boy was so fascinated by the {{U}}mighty{{/U}} river that he would spend hours sitting on its bank and gazing at the passing boats and rafts.

单选题Which of the following is NOT mentioned as an example involving nonverbal thinking in paragraphs 1 and 2?

单选题Our English teacher is sick.A. fatB. weakC. illD. mad

单选题We are going to have the TV fixed .

单选题Improve Computer-research Skills Like many college students, Jose Juarez carries around a pocket-sized computer that lets him watch movies, surf the Internet and text-message his friends. He"s part of "Generation M" —those born after 1985 who 1 up connected to everything from video games to cellphones. "For us, it"s everyday life," said Juarez, 18, a freshman 2 California State University at Sacramento (CSUS). 3 , educators are now saying that not all Generation M-ers can synthesize the piles of information they"re accessing. "They"re geeky (与网络交往的), but they don"t know what to 4 with their geekdom," said Barbara O"Connor, a communications studies professor who has been involved in a nationwide 5 to improve students" computer-research skills. In a recent nationwide test to 6 their technological "literacy" —their ability to use the Internet to complete class assignments—only 49 percent correctly evaluated a set of Web sites for objectivity, authority and timeliness. Only 35 per cent could correctly narrow an overly 7 Internet search. About 130 Sacramento State students, including Juarez, participated in the experimental test, 8 to 6,300 college students across the country. The hour-long assessment test is conducted by Educational Testing Service. It is a web-based scavenger (食肉动物) hunt 9 simulated Internet search engines and academic databases that spit out purposely misleading information. "They"re very good at 10 in and using the Internet, but don"t always understand what they get back," said Linda Goff, head of instructional services for the CSUS library. "You see an open search box, you type in a few words and you 11 the button," said Golf, who is involved in the testing. "They take at face value 12 shows up at the top of the list as the best stuff." Educators say that these sloppy (马虎) research skills are troubling. "We look at that as a foundational skill, in the same way we 13 math and English as a foundational skill," said Lorie Roth, assistant vice-chancellor for academic programs in the CSU system. Measuring how well students can "sort the good 14 the bad" on the Internet has become a higher priority for CSU, Roth said. CSU is considering 15 a mandatory (强制性的) assessment test on technological literacy for all freshmen, much as it has required English and math placement tests since the 1980"s.

单选题We"ve seen a marked shift in our approach to the social issues.

单选题A beautiful woman Uattended/U to me in that store yesterday.

单选题The project required ten years of {{U}}diligent{{/U}} research. A. hardworking B. social C. basic D. scientific

单选题Please Fasten Your Seatbelts Severe turbulence (湍流) can kill aircraft passengers. Now, in test flights over the Rocky Mountains, NASA (美国航空航天局) engineers have successfully detected clear-air turbulence up to 10 seconds before an aircraft hits it. Clear-air turbulence often catches pilots by surprise. Invisible to radar, it is difficult to forecast and can hurl (用力抛出去) passengers about the cabin. In December 1997, one passenger died and a hundred others were injured when unexpected rough air caused a United Airlines flight over the Pacific to drop 300 meters in a few seconds. However, passengers can avoid serious injury by fastening their seatbelts. "It is the only antidote (对策) for this sort of thing," says Rod Bogue, project manager at NASA"s Dryden Flight Research Center in Edwards, California. The centre"s new turbulence detector is based on lidar, or laser radar. Laser pulses are sent ahead of the plane and these are then reflected back by particles in the air. The technique depends on the Doppler effect. The wavelength of the light shifts according to the speed at which the particles are approaching. In calm air, the speed equals the plane"s airspeed. But as the particles swirl (打漩) in rough air, their speed of approach increases or decreases rapidly. The rate of change in speed corresponds to the severity (激烈程度) of the turbulence. In a series of tests that began last month, a research jet flew repeatedly into disturbed air over the mountain ridges (山脉) near Pueblo, Colorado. The lidar detector spotted turbulence between 3 and 8 kilometers ahead, and its forecasts of strength and duration corresponded closely with the turbulence that the plane encountered. Bogue says that he had "a comfortable amount of time" to fasten his seatbelt. The researchers are planning to improve the lidar"s range with a more powerful beam. The system could be installed on commercial aircraft in the next few years.

单选题The room is gloomy but tidy.

单选题They all agreed that the changes that have taken place are substantial.A. significantB. superficialC. inadequateD. inevitable

单选题We were {{U}}shocked{{/U}} to find that Mary did't know her guest's name.

单选题Sonic Device The other day, Dr. Robert Smith, who is blind, took a remarkable stroll through the campus of the University of California at Santa Barbara. As Dr. Smith walked along the campus, places and impediments (障碍物) in his path seemed to call out their names to him -- "library here, library here", "bench here, bench here". Dr. Smith was testing a prototype (样机) navigation system for the blind that anounced the surrounding objects through stereo headphones that were mounted to a computer in his back-pack, creating a virtual reality landscape(仿真影像). The information came not from some miniature radar but from the signals broadcast by the military's network of gloal positioning satellites(全球定位卫星). One day, its developers hope, miniaturized(小型化的) versions of this navigation devices, which now weighs twenty-eight pounds, will help the blind navigate unfamiliar neighborhoods. "With this system you do not need to know a thing in advance about where you are going", said Dr. Roberta Klatzky, a psychologist at Carnegie-Mellon University who is working with Dr. Smith to develop the navigating device. Dr. Michael Oberdor of the National Eye Institute said, "A blind person could walk clown the street and know not just he was at 80th and Broadway, but what stores are around, and that Zabar's delicatessen(熟食店) was up ahead. This navigation system tells you not just where there are obstacles, but your overall location geographically. " It lets blind users construct a mental map of new surroundings and learn their way around. The navigation system uses signals from a computerized map to create a "virtual acoustic display(仿真声音显示). This is a talking map in which large objects seem to announce themselves in the headphones with the precise timing and loudness that would be the case if the objects were actually making a sound. This allows the blind person to sense immediately his or her distance or direction, and use that information for guidance. While no one knows whether it is because blind people tend to develop a sharper sense of hearing, those who have tried the system say that they quickly adapt to locating an object through the sounds. "One of the crucial features of this system is that it takes advantage of sensory paychophysics (感官心理物理学) -- how the brain interprets signals from outside to make a map of your surroundings so you can navigate, " Dr. Oberdor said.

单选题The mail was delayed for two days because of the snow-storm. A. held in B. held up C. held down D. held off

单选题Many visitors find the tempo of life here very difficult. A. kind B. growth C. speed D. spectacle

单选题下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。 Irish Dolphins May Have a Unique Dialect Irish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other. The Channel Dolphin and Wildlife Foundation (SDWF) has been studying a group of up to 120 bottle-nose dolphins in the River Shannon using vocalisations collected on a computer in a cow shed near the River Shannon. As part of a research project, student Ronan Hickey digitised and analysed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated them into six fundamental whistle types and 32 different categories. Of the categories, he found most were used by both sets of dolphins—but eight were only heard from the Irish dolphins. "We are building up a catalogue of the different whistle types they use and trying to associate them with behaviour like foraging, resting, socialising and the communications of groups with calves," project leader Simon Berrow said. "Essentially we are building up what is like a dictionary of words they use or sounds they make. " Berrow, a marine biologist, said the dolphins' clicks are used to find their way around and locate prey. The whistles are communications. "They do a whole range of other sounds like barks, groans and a kind of gunshot. " He said. "The gunshot is an intense pulse of sound. Sperm whales use it to stun their prey. " "When I first heard it I was surprised as I thought sperm whales were the only species who used it. We can speculate the dolphins are using it for the same reason as the sperm whales. " Berrow said. References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been resident there as far back as the 6th century. They are regularly seen by passengers on the Shannon ferry and an estimated 25,000 tourists every year take special sightseeing tours on local boats to visit them.

单选题It is Uridiculous/U to dispute about such things.