单选题{{U}}Although {{/U}}I sympathize．I can’t really do very much to help

单选题This is not {{U}}typical{{/U}} of English, but is a feature of the Chinese language.

单选题The repair work involved modifying two of the windows.

单选题Don't Count on Dung (粪) Conservationists (自然保护主义者) may be miscalculating the numbers of the threatened animals such as elephants, say African and American researchers. The error occurs because of a flaw in the way they estimate animal numbers from the piles of dung the creatures leave behind. The mistake could lead researchers to think that there are twice as many elephants as there really are in some regions according to Andrew Plumptre of the Wildlife Conservation Society (WCS) in New York. Biologist Katy Payne of Comell University in Ithaca, New York, agrees, "We really need to know elephant numbers and the evidence that we have is quite indirect, " says Payne, who electronically tracks elephants. Counting elephants from planes is impossible in the vast rainforests of Central Africa. So researchers often estimate elephant numbers by counting dung piles in a given area. They also need to know the rate at which dung decays because it's extremely difficult to determine these rates. However, researchers counting elephants in one region tend to rely on standard decay rates established elsewhere. But researchers at the WCS have found that this decay rate varies from region to region depending on the climate and environment. Using the wrong values can lead the census astray (离开正道), says Plumptre. He and his colleague Anthony Chifu Nchanji studied decaying elephant dung in the forests of Cameroon. They found that the dung decayed between 55 and 65 per cent more slowly than the dung in the rainforests of neighboring Gabon. If researchers use decay rates from Gabon to count elephants in Cameroon, they would probably find more elephants than are actually around. This could mean estimates in Cameroon are at least twice as high as those derived from decay rates calculated locally, Plumptre says, "However accurate your dung density estimate might be, the decay rate can severely affect the result". Plumptre also says that the dung-pile census should be carried out over a region similar in size to an elephant's natural range. The usual technique of monitoring only small, protected areas distorts numbers because elephants move in and out of these regions, he says, "If the elephant population increases within the protected area, you can not determine whether. It is a real increase or whether it is due to elephants moving in because they are being poached (入侵偷猎) outside." Plumptre says that similar problems may also affect other animal census studies that rely on indirect evidence such as nests, tracks or burrows (地洞).

单选题Nuclear Power and Its Danger Nuclear power"s danger to health, safety, and even life itself can be summed up in one word: radiation. Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can"t be seen or heard, or touched, or tasted, even though it may be all around There are other things like that. For example, radio waves are all around us but we can"t detect them, sense them, without a radio receiver. Similarly, we can"t sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things. At very high levels, radiation can kill an animal or human being outright by killing masses of cells in vital organs. But even the lowest level of radiation can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be significant. This is the case when only a few cells are hit, and if they are killed outright. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in a deformed way. They can grow into cancer. Sometimes this does not show up for many years. This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the victim being aware at the time that damage has occurred. A person can be irradiated and feel fine, then die of cancer five, ten, or twenty years later as a result. Or a child can be born weak or liable to serious illness as a result of radiation absorbed by its grandparents. Radiation can hurt us. We must know the truth.

单选题Patricia stared at the other girls with resentment .

单选题Michael is now merely a good friend.

单选题She's one of the {{U}}smartest{{/U}} students in the whole school.

单选题She was grateful to him for being so good to her.

单选题He was （tempted） by the high salary offered by the company.

单选题The great changes of the city astonished every visitor to it.

单选题They have been living under the most appalling conditions for two years.

单选题 Stress Level Tied to Education Level People with less education suffer fewer stressful days, according to a report in the current issue of the Journal of Health and Social Behavior. However, the study also found that when less-educated people did suffer stress it was more severe and had a larger impact on their health. From this researchers have concluded that the day-to-day factors that cause stress are not random, where you are in society determines the kinds of problems that you have each day, and how well you will cope with them. The research team interviewed a national sample of 1,031 adults daily for eight days about their stress level and health. People without a high school diploma reported stress on 30 percent of the study days, people with a high school degree reported stress 38 percent of the time, and people with college degrees reported stress 44 percent of the time. "Less advantaged people are less healthy on a daily basis and are more likely to have downward turns in their health," lead researcher Dr. Joseph Grzywacz, of Wake Forest University Baptist Medical Center, said in a prepared statement. "The downward turns in health were connected with daily stressors, and the effect of daily stressors on their health is much more devastating for the less advantaged." Grzywacz suggested follow-up research to determine why less-educated people report fewer days of stress when it is known their stress is more acute and chronic. "If something happens every day, maybe it's not seen as a stressor," Grzywacz says. "Maybe it is just life."

单选题 第一篇 The Public Health System One of the biggest changes since 1990 is the degree to which bioterrorism has become a public health priority. Although there had long been concern about vulnerability to biowarfare and bioterrorism the anthrax episode in the fall of 2001 made it clear that the concern is no longer theoretical. Until very recently, the important role of public health at the frontlines of bioterrorism preparedness was unrecognized. Although concern about emerging infections has helped stimulate funding for the chronically under-appreciated public health system, the threat of bioterrorism motivated the first real infusion of new money into public health in decades. Many of the capabilities needed to defend against bioterrorism are the same: as those needed to combat natural emerging infections. In both instance, the problem is an unexpected outbreak of infectious disease, of which the first indication is likely to be sick people in emergency rooms or clinics. Indeed, as with the anthrax attacks, the public health and medical responses may be under way before the true nature of the outbreak is recognized. Public health and the interface with the health care system are therefore key elements in any effective response to bioterrorism. Whether the biggest threat is natural or engineered much remains to be done. Efforts to strengthen surveillance and response worldwide and to improve communication must be accelerated and sustained. Further, we have only scratched the surface in terms of understanding the ecology of infectious diseases and developing strategies for regulating microbial traffic. We need tools for better predictive epidemiologic modeling when a new infection first appears and for better analysis of the factors that transfer pathogens across species. One encouraging development is the program in the ecology of infectious diseases that was started a few years ago be the National Science Foundation in cooperation with NIH. SARS is a good yardstick of our progress during the past 13 years. The syndrome was unusual because novel infections that spread from person to person are relatively rare. Once cases were finally reported, the public health response was vigorous. WHO warned health care providers, researchers rapidly identified a candidate virus, and prototype diagnostic tests quickly became available. The vast reach of the Internet was instrumental in sharing formation and coordinating activities worldwide. Despite these advances, SARS had already spread to many countries. In fact had the disease been as transmissible as influenza, it would have invaded virtually every country in the world by the time the public health response had begun. So what SARS tells us is that although we have come long way since 1990, we still have a long way to go.

单选题If there should be human beings on other planets, they would be radically different from Americans.

单选题Brilliantly colored flowers attract insects.

单选题A Letter from Alan I have learnt of a plan to build three hundred houses on the land called Parson's Place by the football ground. Few people know about this new plan to increase the size of our town. For me, Parson's Place is special because it is a beautiful natural area where local people can relax--the small wood has many unusual trees and the stream is popular with fishermen and bird-watchers. It's very quiet because there are few houses or roads nearby. I think that losing this area will be terrible because we have no other similar facilities in the neighbourhood. I am also against this plan because it will cause traffic problems. How will the people from the new houses travel to work? The motorway and the railway station are on the other side of town. Therefore, these people will have to drive through the town centre every time they go anywhere. The roads will always be full of traffic, there will be nowhere to park and the tourists who come to see our lovely old buildings will leave. Shops and hotels will lose business. If the town really needs more homes, the empty ground beside the railway station is a more suitable place. No doubt the builders will make a lot of money by selling these houses. But, in my opinion, the average person will quickly be made poorer by this plan. As well as this, we will lose a very special place and our town will be much less pleasant. I am going to the local government offices on Monday morning to protest about this plan and I hope that your readers will join me there. We must make them stop this plan before it is too late.

单选题 {{B}}How to download?{{/B}} There are literally millions and millions of files available all over the Internet. With a simple search command, you can find fonts, programs, games, graphics, sounds, movies, stationery, and just about anything else that you can imagine. In order to get these products and files, you must learn how to download. Here are some of the things that are recommended. Make sure you have an anti-virus program installed, operational and with up-to-date definitions. This is critical as you may run across a virus and if so, you could put your entire computer at risk. Anti-virus software is an inexpensive insurance. If you are going to install a program, be sure that you've updated your emergency disk and have a recent backup. This is very important for downloads that change system information. Store your downloads in a special directory. Create a directory called "Distributions," and inside that directory put subdirectories—one subdirectory for each product. In those subdirectories, save the setup files, documentation and anything else that you need to install the program. Store your downloaded treasures on a drive other than the C drive. This is to keep your C drive for system files and applications, and your other drives for data. Find the files to download. There are so many sites with files to download that it would be impossible to list them all in one place. There are literally thousands of sites with just graphics and clip are files alone, much less programs, games and everything else. Some good places to start looking include: Softseek. com—lots of good shareware and freeware products download, com—more programs to download Save the downloaded file in your download directory. Decompress the downloaded file. A lot of downloads need to be decompressed. The ". ZIP" file type means the file is compressed and must be decompressed before it can be used. You can do this with any number of utilities, including Conversion Plus and Winzip. Files ending with an ".EXE" must be executed. These files will typically begin a dialog for installation once you double-click on the file. Install or use the downloaded files. If you've downloaded a program, then install it. For graphics and sounds and such, use as appropriate. Clean up. If you are limited on disk space, you should delete the . ZIP or . EXE file that you downloaded once you've installed the application. You should also clean up any other miscellaneous files that are left over from the download process. Delete the files in TEMP directory after doing any kind of installation.

单选题It seems that only Mary is eligible for the job.

单选题The {{U}}last{{/U}} few weeks have been enjoyable. A. close B. near C. past D. several