填空题简言之,productivity is merely a measure of effectiveness with which people produce goods and services.

填空题Of the three cavities, phraynx cavity is the most variable and active in amplifying and modifying speech sounds.

填空题Predicate logic, also called predicate calculus, studies the internal structure of simple propositions. In this logical system, propositions like Socrates is a man will be analyzed into two parts;______and a predicate.

填空题知者不惑，仁者不忧，勇者不惧。

填空题______ powerful

填空题[A] What route does HIV take after it enters the body to destroy the immune system?[B] How and when did the long-standing belief concerning AIDS and HIV crop up?[C] What is the most effective anti-HIV therapy?[D] How does HIV subvert the immune system?[E] In the absence of a vaccine, how can HIV be stopped?[F] Why does AIDS predispose infected persons to certain types of cancer and infections? In the 20 years since the first cases of AIDS were detected, scientists say they have learned more about this viral disease than any other. Yet Peter Piot, who directs the United Nations AIDS program, and Stefano Vella of Rome, president of the International AIDS Society, and other experts say reviewing unanswered questions could prove useful as a measure of progress for AIDS and other diseases. Among the important broader scientific questions that remain:41．_____________. A long-standing belief is that cancer cells constantly develop and are held in check by a healthy immune system. But AIDS has challenged that belief. People with AIDS are much more prone to certain cancers like non-Hodgkins lymphomas and Kaposi's sarcoms, but not to breast, colon and lung, the most common cancers in the United States. This pattern suggests that an impaired immune system, at least the type that occurs in AIDS, does not allow common cancers to develop.42．_______________. When HIV is transmitted sexually, the virus must cross a tissue barrier to enter the body. How that happens is still unclear. The virus might invade directly or be carried by a series of different kinds of cells. Eventually HIV travels through lymph vessels to lymph nodes and the rest of the lymph system. But what is not known is how the virus proceeds to destroy the body's CD-4 cells that are needed to combat invading infectious agents.43．_______________. Although HIV kills the immune ceils sent to kill the virus, there is widespread variation in the rate at which HIV infected people become ill with AIDS. So scientists ask: Can the elements of the immune system responsible for that variability be identified? If so, can they be used to stop progression to AIDS in infected individuals and possibly prevent infection in the first place?44．_______________. In theory, early treatment should offer the best chance of preserving immune function. But the new drugs do not completely eliminate HIV from the body so the medicines, which can have dangerous side effects, will have to be taken for a lifetime and perhaps changed to combat resistance. The new policy is expected to recommend that treatment be deferred until there are signs the immune system is weakening. Is a vaccine possible? There is little question that an effective vaccine is crucial to controlling the epidemic. Yet only one has reached the stage of full testing, and there is wide controversy over the degree of protection it will provide. HIV strains that are transmitted in various areas of the world differ genetically. It is not known whether a vaccine derived from one type of HIV will confer protection against other types.45．_______________. Without more incisive, focused behavioral research, prevention messages alone will not put an end to the global epidemic.

填空题How could you have done so much in so a short time?

填空题We must rely on out own efforts to convert the results of scientific research into productivity.

填空题据报道 a student of Beijing University has a habit of climbing on roofs in his sleep.

填空题Police were sent to disperse the crowds but ended up by shooting down protestersand it was in this chaos that the seeds of political liberation were sown.A.PoliceB.by shootingC.thisD.sown

填空题I saw the man knocked down by a car in the street.

填空题A. differentB. happenC. repeatD. braveE. easyF. tryG. prefer

填空题Regarding insurance, the coverage is ______ 110/% of invoice value up ______ the port of destination only.

填空题This is the {{U}}longest{{/U}} flight I {{U}}have ever taken{{/U}}. By the time we get to Los Angeles, we {{U}}had flown{{/U}} {{U}}for{{/U}} 9 hours. A. longest B. have ever taken C. had flown D. for

填空题Directions: In the following article, some sentences have been removed. For Questions 41- 45, choose the most suitable one from the list A-G to fit into each of the numbered blank. There are two extra choices, which do not fit in any of the gaps. Mark your answers on ANSWER SHEET 1. (10 points) You don't have to convince Steve Backley of the power of the mind over the body. When the British javelin thrower, who won bronze in Barcelona in 1992 and silver in Atlanta in 1996, was unable to walk (let alone train ) after spraining his ankle a few years ago, he worked out in a "mental gym". Sitting in a chair, he imagined himself throwing the javelin in every one of the world's major track-and-field stadiums, until he had racked up about a thousand hurls. 41.______ Whether it is golfer Earl Woods teaching his son Tiger to form a mental image of the ball's rolling into the hole, or Olympic weight-lifter Tara Nott's training her brain to block out distractions, a strong mental game has always been part of elite sports. Michael Jordan, Nancy Kerrigan and Jack Nicklaus all practiced their moves mentally; Jean-Claude Killy used to ski a slalom course in his head many times before exploding out of the starting gate. "Everybody is pretty much at the same level physically," says American diver Michelle Davison, "[ The difference comes down to] who can hold it together mentally. " 42. ______ While coaches and trainers have long emphasized the importance of the mental game, exactly how the mind affects the body's performance has always been a bit of a mystery, with buzzwords like "in the zone" and "mental imagery" carrying a vague whiff of quackery. 43. ______ "Mental practice can actually increase real-world strength and performance," says neuroscientist Ian Robertson of Trinity College Dublin, who describes the power of mental workouts in his engaging new book, Mind Sculpture. "Pumping virtual iron physically changes the brain—and the brain, after all, controls the body. " 44. ______ Imagine, in your mind's eye, a harp in all its graceful detail; the same region of your visual cortex just turned on as if you actually looked at the instrument. But what matters to athletes is that, just as visual imagery activates the brain's visual cortex, so imagining movement activates the motor cortex, notes Harvard University's Stephen Kosslyn, who has done pioneering research on imagery. Imagine tensing and relaxing the muscles of your right index finger, but without actually moving. Were you to do this for several minutes every day for four weeks, at the end of the period the strength of that finger would increase by 20% or so, as researchers found in 1992 when they had volunteers follow this mental regimen. Nothing changed in the finger muscles themselves as a result of the imagery. 45. ______ That's probably why imaging is such a powerful, and popular, mental workout for athletes.[A] The reason is that visualization activates many of the same neural circuits that actually seeing does.[B] The same process likely occurred in Backley's brain as he mentally hurled the javelin. "Through mental practice, [he] kept stimulating the networks of connected neurons where his skill was embroidered," Robertson writes.[C] He returned to competition a few weeks later making his top distances; usually, losing weeks of throwing practice will set you back inches—and in sports of course, inches might as well be miles.[D] Instead connections between nerves and the muscles they control, in a circuit starting in the motor cortex of the brain, got stronger. "The improvements in strength were caused by changes in the brain," says Robertson.[E] But just as physicians are showing that something as inchoate as a positive outlook can affect something as real as the progress of breast cancer, so scientists are uncovering how mental imagery and other tricks of the athlete's trade affect the real, physical brain and hence the body.[F] That lesson has not been lost on the U. S. Olympic Committee. It had one full-time sports psychologist in 1988. Today it has five.[G] A 1995 study in Boston compared the brain regions of people who physically practiced a five- finger piano exercise with people who mentally practiced it. In both groups the area of the brain devoted to moving the fingers got bigger and accuracy improved.