单选题When bothered by other animals or humans, some species of horned lizards will posture Uthreateningly /Uand squirt blood from their eyes.

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单选题He never exerts himself to aid those trying to ______ a difficult situation.

单选题{{B}}Passage 4{{/B}} For Emily Dickinson there were three worlds, and she lived in all of them, making them the substance of everything that she thought and wrote. There was the world of nature, the things and the creatures that she saw, heard, felt about her, there was the "estate" that was the world of friendship. And there was the world of the unseen and unheard. From her youth she was looked upon as different. She was direct, impulsive, original, and the droll wit who said unconventional things which others thought but dared not speak, and said them incomparably well. The characteristics which made her inscrutable to those who knew her continue to bewilder and surprise, for she lived by paradoxes. Certainly the greatest paradox was the fact that the three most pervasive friendships were the most elusive. She saw the Reverend Charles Wadsworth of Philadelphia but three or four times in the course of her life, and then briefly, yet her admiration of him as an ideal and her yearning for him as a person were of us surpassed importance in her growth as a poet. She sought out for professional advice the critic and publicist Thomas Wentworth Higginson and invited his aid as mentor for more than twenty years, though she never once adopted any counsel he dared to hazard. In the last decade of her life, she came to be a warm admirer of the poet and novelist Helen Hunt Jackson, the only qualified judge among Emily Dickinson's contemporaries who believed her to be a great poet, yet Emily Dickinson steadfastly refused to publish even though Mrs. Jackson' s importunity was insistent.

单选题Many species of animals which once lived on the earth are no longer in ______.

单选题Housewives who do not go out to work often feel they are not working to their full______ A. capacity B. strength C. length D. possibility

单选题Big businesses enjoy certain ______ that smaller ones do not have. A. transactions B. privileges C. subsidies D. substitutes

单选题Analysts have had their go at humor, and I have read some of this interpretative literature, but without being greatly instructed. Humor can be dissected, as a frog can, but the thing dies in the process and the innards are discouraging to any but the pure scientific mind. In a newsreel theatre the other day, I saw a picture of a man who had developed the soap bubble to a higher point than it had never before reached. He had became the ace soap bubble blower of America, had perfected the business of blowing bubbles, refined it, doubled it, squared it, and had even worked himself up into a convenient lather. The effect was not pretty. Some of the bubbles were too big to be beautiful, and the blower was always jumping into them or out of them, or playing some sort of unattractive trick with them. It was, if anything, a rather repulsive sight. Humor is a little like that. it won't stand much blowing up, and it won't stand much poking, it has a certain fragility, an evasiveness, which one had best respect. Essentially, it is a complete mystery. A human frame convulsed with laughter, and the laughter becoming hysterical and uncontrollable, is as far out of balance as one shaken with the hiccoughs or in the throes of sneezing fit. One of the things commonly said about humorists is that they are really very sad people-clowns with a breaking heart. There is some truth in it, but it is badly stated. It would be more accurate, I think, to say that there is a deep vein of melancholy running through everyone's life and that the humorist, perhaps more sensible of it than some others, compensates for it actively and positively. Humorists fatten on trouble. They have always made trouble pay. They struggle along with a good will and endure pain cheerfully, knowing how well it will serve them in the sweet by and by. You find them wrestling with foreign languages, fighting folding ironing boards and swollen drainpipes, suffering the terrible discomfort of tight boots (or as Josh Billing wittily called them, "tite" boots). They pour out their sorrows profitably, in a form that is not quite fiction nor quite fact. Beneath the sparkling surface of these dilemmas flows the strong tide of human woe.

单选题Digging the garden with a spade is a very ______ task. I am exhausted after such two-hour's work. A. industrious B. manual C. conscientious D. laborious

单选题In their world of darkness, it would seem likely that some of the animals might have become blind, as has happened to some cave fauna. So, indeed, many of them have, compensating for the lack of eyes with marvelously developed feelers and long, slender fins and processes with which they grope their way, like so many blind men with canes, their whole knowledge of friends, enemies, or food coming to them through the sense of touch. The last traces of plant life are left behind in the thin upper layer of water for no plant can live below about 600 feet even in very clear water, and few find enough sunlight for their food-manufacturing activities below 200 feet. Since no animal can make its own food, the creatures of the deeper waters live a strange, almost parasitic existence of utter dependence on the upper layers. These hungry carnivores prey fiercely and relentlessly upon each other, yet the whole community is ultimately dependent upon the slow rain of descending food particles from above. The components of this never-ending rain are the dead and dying plants and animals from the surface, or from one of the intermediate layers. For each of the horizontal zones or communities of the sea that lie between the surface and the sea bottom, the food supply is different and in general poorer than for the layer above. Pressure, darkness, and silence are the conditions of life in the deep sea. But we know now that the conception of the sea as a silent place is wholly false. Wide experience with hydrophones and other listening devices for the detection of submarines has proved that, around the shore lines of much of the world, there is the extraordinary uproar produced by fishes, shrimps, porpoises and probably other forms not yet identified. There has been little investigation as yet of sound in the deep, offshore areas, but when the crew of the Atlantis lowered a hydrophone into deep water off Bermuda, they recorded strange mewing sounds, shrieks, and ghostly moans, the sources of which have not been traced. But fish of shallower zones have been captured and confined in aquaria, where their voices have been recorded for comparison with sounds heard at sea, and in many cases satisfactory identification can be made. During the Second World War the hydrophone network set up by the United States Navy to protect the entrance to Chesapeake Bay was temporarily made useless when, in the spring of 1942, the speakers at the surface began to give forth, every evening, a sound described as being like "a pneumatic drill tearing up pavement". The extraneous noises that came over the hydrophones completely masked the sounds of the passage of ships. Eventually it was discovered that the sounds were the voices of fish known as croakers, Which in the spring move into Chesapeake Bay from the offshore wintering grounds. As soon as the noise had been identified and analyzed, it was possible to screen it out with an electric filter, so that once more only the sounds of ships came thorugh the speakers.

单选题To fight against computer crimes, a computer system needs a sure way of identifying its right users and rejecting those who are not entitled to use it. The identification system should be quick, simple, and convenient. At present, signatures are widely used to identify credit card holders, but it takes an expert to detect a good forgery. Sometimes even a human expert is fooled, and there is no reason to believe that a computer could do any better. Photographs are also sometimes used for identification. But, people find it inconvenient to stop by a credit-card company and to be photographed. Companies might lose business if they made the pictures under absolute requirement. Also, photographs are less useful these days, when people frequently change their appearance by changing the way they wear their hair. Finally, computer programs for analyzing photographs are still highly experimental. Cash-drawing systems often use two identification numbers: One is recorded on a magnetic stripe on the identification cards, and the other is given to the CRS holder. When the user inserts his card into the cash-drawing terminal, he keys in the identification number he has been given. The computer checks to see that the number recorded on the card and the other keyed in by the user refer to the same person. For a long time, fingerprints have provided a method of positive identification. But they suffer from two problems. One is that there is no simple system for comparing fingerprints electronically, the other is that because most people associate being fingerprinted with being arrested~ they almost surely would resist being fingerprinted for routine identification. Voiceprints have been suggested. With these, the user has only to speak a few words for the computer to analyze his voice. There are no psychological problems here. And technically it's easier to take and analyze voiceprints than fingerprints. However, it has yet to be proved that the computer cannot be fooled by imitation. Also, the voice is subjected to the noise and distortion of a telephone line. Even lip-prints have been suggested. But it's doubtful that kissing computers will ever catch on.

单选题The police had decided not to proceed with a prosecution against Irwin, ______ that it was highly unlikely that any jury in the land would wish to punish him for doing this mercy killing.

单选题Weather exports use the ______ of the barometer as one of their guides in predicting the weather.

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单选题We brought ______ at the football match.

单选题 The Aleuts, residing on several islands of the Aleutian Chain, the Pribilof islands, and the Alaskan Peninsula, have possessed a written language since 1825, when the Russian missionary Ivan Veniaminov selected appropriate characters of the Cyrillic alphabet to represent Aleut speech sounds, recorded the main body of Aleut vocabulary, and formulated grammatical rules. The Czarist Russian conquest of the proud, independent sea hunters was so devastatingly thorough that tribal traditions, even tribal memories, were almost obliterated. The slaughter of the majority of an adult generation was sufficient to destroy the continuity of tribal knowledge, which was dependent upon oral transmission. As a consequence, the Aleuts developed a fanatical devotion to their language as their only cultural heritage. The Russian occupation placed a heavy linguistic burden on the Aleuts. Not only were they compelled to learn Russian to converse with their overseers and governors, but they had to learn Old Slavonic to take an active part in church services as well as to master the skill of reading and writing their own tongue. In 1867, when the United States purchased Alaska, the Aleuts were unable to break sharply with their immediate past and substitute English for any one of their three languages. To communicants of the Russian Orthodox Church a knowledge of Slavonic remained vital, as did Russian, the language in which one conversed with the clergy. The Aleuts came to regard English education as a device to wean them from their religious faith. The introduction of compulsory English schooling caused a minor renascence of Russian culture as the Aleut parents sought to counteract the influence of the schoolroom. The harsh life of the Russian colonial rule began to appear more happy and beautiful in retrospect. Regulations forbidding instruction in any language other than English increased its unpopularity, The superficial alphabetical resemblance of Russian and Aleut linked the two tongues so closely that every restriction against teaching Russian was interpreted as an attempt to eradicate the Aleut tongue. From the wording of many regulations, it appears that American administrators often had not the slightest idea that the Aleuts were clandestinely reading and writhing their own tongue or even had a written language of their own. To too many officials, anything in Cyrillic letters was Russian and something to be stamped out. Bitterness bred by abuses and the exploitations the Aleuts suffered from predatory American traders and adventurers kept alive the Aleut resentment against the language spoken by Americans. Gradually, despite the failure to emancipate the Aleuts from a sterile past by relating the Aleut and English languages more closely, the passage of years has assuaged the bitter misunderstandings and caused an orientation away from Russian toward English as their second language, but Aleut continues to be the language that molds their thought and expression.

单选题The main point of paragraph 2 is ______.