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由权值为29、12、15、6、23的五个叶子节点构造的哈夫曼树为 (61) ，其带权路径长度为 (62) 。
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Directions:For each blank in the following passage, choose the best answer from the choices given below. Mark your answer on the Answer Sheet by drawing with a pencil a short bar across the corresponding letter in the brackets.How does water scarcity affect people First of all, it (31) their health. It is not that they will die of thirst; rather, the poor quality of the water (32) for cooking and drinking may make them ill.(33) our bodies require water to treat waste products, plentiful water is required for proper sanitation (卫生)—water that for much of mankind is simply not available. (34) people without adequate sanitation rose from 2.6 billion in 1990 to 2.9 billion in 1999. And sanitation is literally a matter of life and death. In a (35) statement, United Nations officials warned:"When children lack water that is fit for drinking and sanitation, virtually every aspect of their health and development is (36) ."Food production is dependent on water. Many crops, of course, are watered by rain, but in recent times irrigation has become the key (37) the world% booming population. Today percent of the world’s harvest depends on irrigation.If plentiful water flows out of every tap in our home and if we have a clean toilet (抽水马桶) that conveniently washes out waste, it may be (38) to believe that the world is running out of an adequate supply of water. We should remember, however, that only 20 percent of mankind enioy such (39) .In Africa many women spend as much as six hours a day (40) water. 40（）
Passage FourNot so long ago almost any student who successfully completed a university degree could, find a good career quite easily. Companies toured the academic institutions, competing with each other to select graduates. However, those days are gone, even in Hong Kong, and nowadays graduates often face strong competition in the search for jobs.Most careers organizations highlight three stages for graduates to follow in the process of securing a suit- able career: recognizing abilities, matching these to available jobs and presenting them well to possible employers,Job seekers have to make a careful assessment of their own abilities. One area of assessment should be of their academic qualifications, which would include special skills within their subject area. Graduates should also consider their own personal values and attitudes. An honest assessment of personal interests and abilities such as creative skills, or skills acquired from work experience, should also be given careful thought.The second stage is to study the opportunities available for employment and to think about how the general employment situation is likely to develop in the future. To do this, graduates can study job and position information in newspapers, or they can visit a careers office, write to possible employers for information or contact friends or relatives who may already be involved in a particular profession. After studying all the various options, they should be in a position to make informed comparisons between various careers.Good personal presentation is essential in the search for a good career, job application forms and letters should, of course, be filled in carefully and correctly, without grammar or spelling errors. Where additional information is asked for, job seekers should describe their abilities and work experience in more depth, with examples if possible. They should try to balance their own abilities with the employer% needs, explain why they are interested in a career with the particular company and try to show that they-already know somethingabout the company and its activities.When graduates go to an interview, they should prepare properly by finding out all they can about the possible employer. Dressing suitably and arriving for the interview on time are also important. Interviewees should try to give positive and helpful answers and should not be afraid to ask questions about anything they are unsure about. This is much better than pretending to understand a question and giving an unsuitable answer. According to Paragraph 4, graduates should （）.
Directions:In this part there are 4 passages followed by questions or unfinished statements, each with four suggested answers. Choose the one you think is the best answer. Mark your choice on the Answer Sheet by drawing with a pencil a short bar across the corresponding letter in the brackets.Passage OneMost people think of lions as strictly African beasts, but only because they’s been killed off almost everywhere else. Ten thousand years ago lions spanned vast sections of the globe. Now lions hold a small fraction of their former habitat, and Asiatic lions, a subspecies that spit from African lions perhaps 100,000 years ago, hang on to an almost impossibly small slice of their former territory.India is the proud steward of these 300 or so lions, which live primarily in a 560-square-mile sanctuary (保护区). It took me a year and a half to get a permit to explore the entire Gir Forest-and no time at all to see why these lions became symbols of royalty and gieatness. A tiger will hide in the forest unseen, but a lion stands its ground, curious and unafraid—lionhearted. Though they told me in subtle ways when I got too close, Gir’s lions allowed me unique glimpses into their lives during my three months in the forest. It’s odd to think that they are threatened by extinction; Git has as many lions as it can hold—too many, in fact. With territory in short supply, lions move about near the boundary of the forest and even leave it altogether, often clashing with people. That’s one reason India ’is creating a second sanctuary. There are other pressing reasons: outbreaks of disease or natural disasters. In 1994 a serious disease killed more than a third of Africa’sSerengeti lions—a thousand animals—a fate that could easily happen to Gir’s eats. These lions are especially vulnerable to disease because they descend from as few as a dozen individuals. "If you do a DNA test, Asiatic lions actually look like identical twins," says Stephen O’ Brien, a geneticist(基因学家) who has studied them. Yet the dangers are bidden, and you wouldn’t suspect them by watching these lords of the forest. The lions display vitality, and no small measure of charm.Though the gentle intimacy of play vanishes when it’ s time to eat, meals in Git are not necessarily frantic affairs. For a mother and her baby lion sharing a deer, or a young mate eating an antelope(羚羊), there’s no need to fight for a cut of the kill. The animals they hunt for food are generally smaller in Gir than those in Africa, and hunting groups tend to be smaller as well. The lions in the Git Forest are especially vulnerable to disease because （）.
Directions:In this part there are 4 passages followed by questions or unfinished statements, each with four suggested answers. Choose the one you think is the best answer. Mark your choice on the Answer Sheet by drawing with a pencil a short bar across the corresponding letter in the brackets.Passage OneMost people think of lions as strictly African beasts, but only because they’s been killed off almost everywhere else. Ten thousand years ago lions spanned vast sections of the globe. Now lions hold a small fraction of their former habitat, and Asiatic lions, a subspecies that spit from African lions perhaps 100,000 years ago, hang on to an almost impossibly small slice of their former territory.India is the proud steward of these 300 or so lions, which live primarily in a 560-square-mile sanctuary (保护区). It took me a year and a half to get a permit to explore the entire Gir Forest-and no time at all to see why these lions became symbols of royalty and gieatness. A tiger will hide in the forest unseen, but a lion stands its ground, curious and unafraid—lionhearted. Though they told me in subtle ways when I got too close, Gir’s lions allowed me unique glimpses into their lives during my three months in the forest. It’s odd to think that they are threatened by extinction; Git has as many lions as it can hold—too many, in fact. With territory in short supply, lions move about near the boundary of the forest and even leave it altogether, often clashing with people. That’s one reason India ’is creating a second sanctuary. There are other pressing reasons: outbreaks of disease or natural disasters. In 1994 a serious disease killed more than a third of Africa’sSerengeti lions—a thousand animals—a fate that could easily happen to Gir’s eats. These lions are especially vulnerable to disease because they descend from as few as a dozen individuals. "If you do a DNA test, Asiatic lions actually look like identical twins," says Stephen O’ Brien, a geneticist(基因学家) who has studied them. Yet the dangers are bidden, and you wouldn’t suspect them by watching these lords of the forest. The lions display vitality, and no small measure of charm.Though the gentle intimacy of play vanishes when it’ s time to eat, meals in Git are not necessarily frantic affairs. For a mother and her baby lion sharing a deer, or a young mate eating an antelope(羚羊), there’s no need to fight for a cut of the kill. The animals they hunt for food are generally smaller in Gir than those in Africa, and hunting groups tend to be smaller as well. In the first paragraph, the author tells us that Asiatic lions （）.
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