单选题The Salk polio vaccine provides immunity from that disease.

单选题Every chemical change either results from energy being used to produce the change, or causes energy to be ______ in some form. A. given off B. put out C. set off D. used up

单选题Floors and walls must be specially constructed to make a building Usoundproof/U.

单选题Hitler was armed to the teeth when he______the Second World War.

单选题______ there was not a soul around except some cars passing occasionally.

单选题The committee reported its {{U}}findings{{/U}} after a thorough investigation.

单选题{{B}}Directions:{{/B}} There are 4 reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C, and D. You should decide on the best choice and mark your answer on the ANSWER SHEET by blackening the corresponding letter in the brackets.{{B}}Passage 1{{/B}} One of the youngest independent countries in the Western Hemisphere, Trinidad and Tobago, became a nation on August 31, 1962. For a long time this nation has attracted tourists——it is the home of calypso music and limbo dancing——and in recent years its healthy economy has attracted investors as well. Trinidad and Tobago is a single country composed of two islands.. Trinidad, with the majority of the country's 900,000 inhabitants, is a rectangle of roughly fifty by forty miles. Tobago, nineteen miles to the north, is smaller and has a population of about 35,000. Situated at the end of the long chain of Windward and Leeward Islands, Trinidad is at one point only seven miles off the coast of Venezuela. Its geology, flora, and fauna are similar to those of the South American mainland. Like Venezuela, the backbone of Trinidad and Tobago's economy is petroleum and its first colonists were Spaniards. Three mountain ranges, with summits of up to 3,000 feet, cross Trinidad from east to west, while Tobago is a relatively flat coral island, rimmed with fine beaches. The broad plains between Trinidad's mountain ranges are dominated by vast fields of sugar cane that present a symmetrical green pattern when seen from the air. A closer inspection reveals the coconut plantations along the coast and the profusion of brilliant red and yellow flowers of various species that are found all over the island. Houses on both islands tend to be light-colored, with an open style of architecture, in many cases with open space under the entire dwelling. Port-of-Spain, the capital, is a bustling modern city where the pulse of the people reflects Britist, Spanish, and East Indian influences.

单选题The novel, which is a work of art, exists not by its ______ life, but by its immeasurable difference from life.

单选题She is ______ to sprain her ankle because it is weak from 3 previous pains.

单选题Because the children keep interrupting her whenever she reads a book, she is always ______her place.

单选题

单选题The new computer virus ______, the system was restored to its normal operation. A. having removed B. being removed C. had been removed D. was removed

单选题The American Revolution had no medieval legal institutions to ______ or to root out, apart from monarchy. A. discard B. discreet C. discord D. disgorge

单选题Communicating orally involves more than reading or talking: gesture, posture, movements may all be ______ to it.

单选题Don't throw ______ the sponge yet! You may still have a chance to win!

单选题Divorced from his wife just three months ago, he has made quite a ______ of himself by gallivanting about with his new girlfriend, a former supermodel.

单选题Chronic insomnia is a major public health problem. And too many people are using 1 therapies, even while there are a few treatments that do work. Millions of Americans lie awake at night counting sheep or have a stiff drink or 2 a pill, hoping it will make them sleepy. But experts agree all that self-medicating is a bad idea, and the causes of chronic insomnia remain 3 . Almost a third of adults have trouble sleeping, and about 10 percent have symptoms of daytime 4 that signal true insomnia. But 5 the complaints, scientists know surprisingly little about what causes chronic insomnia, its health consequences and how best to treat it, a panel of specialists brought together by the National Institutes of Health concluded Wednesday. The panel called for a broad range of research into insomnia, 6 that if scientists understood its 7 causes, they could develop better treatments. Most, but not all, insomnia is thought to accompany other health problems, from arthritis and depression to cardiovascular disease. The question often is whether the insomnia came first or was a result of the other diseases and how trouble sleeping 8 complicates those other problems. Other diseases aside, the risk of insomnia seems to increase with age and to be more common among women, especially after their 50s. Smoking, caffeine and numerous 9 drugs also affect sleep. The NIH is spending about $200 million this year on sleep-related research, some 10 to specific disorders and others examining the underlying scientific laws that control the nervous system of sleep. The agency was awaiting the panel"s review before deciding what additional work should be directed at insomnia.

单选题If sustainable competitive advantage depends on work-force skills, American firms have a problem. Human resource management is not traditionally seen as central to the competitive survival of the firm in the United States. Skill acquisition is considered as an individual responsibility. Labor is simply another factor of production to be hired or rented at the lowest possible cost much as one buys raw materials or equipment. The lack of importance attached to human resource management can be seen in the corporation hierarchy. In an American firm the chief financial officer is almost always second in command. The post of head of human resource managements is usually a specialized job, often at the edge of the corporate hierarchy. The executive who holds it is never consulted on major strategic decisions and has no chance to move up to Chief Executive Officer (CEO). By way of contrast, in Japan the head of human resource management is central—usually the second most important executive, after the CEO, in the firm"s hierarchy. While American firms often talk about the vast amounts spent on training their work-forces, in fact they invest less in the skill of their employees than do the Japanese or German firms. The money they do invest is also more highly concentrated on professional and managerial employees. And the limited investments that are made in training workers are also much more narrowly focused on the specific skills necessary to do the next job rather than on the basic background skills that make it possible to absorb new technologies. As a result, problems emerge when new breakthrough technologies arrive. If American workers, for example, take much longer to learn how to operate new flexible manufacturing stations than workers in Germany (as they do), the effective cost of those stations is lower in Germany than it is in the United Stated. More time is required before equipment is up and running at capacity, and the need for extensive retraining generates costs and creates bottlenecks that limit the speed with which new equipment can be employed. The result is a slower pace of technological change. And in the end the skills of the bottom half of the population affect the wages of the top half. If the bottom half can"t effectively staff the processes that have to be operated, the management and professional jobs that go with these processes will disappear.

单选题He asked no one's permission; he did it ______ his own account.

单选题From the definitions of the three points of view, according to the passage, we can infer that ______.