单选题有5个考官给8个考生打分，分数从1分到10分，如果8个考生的得分分别为25、30、13、34、15、48、36和35，那么至少得了一个或者一个以上7分的考生数是多少?

单选题 ①During the Pleistocene epoch

单选题 ①Recently

单选题R＜0＜TQuantity A: RTQuantity B: 0

单选题9. TEB Attorney: TEB Corporation has been accused of not doing enough to discourage its executives from defrauding the government. This accusation is obviously false, since TEB, following its own written policy, rewards those who report the wrongdoing of others and promptly fires proven wrongdoers. Which of the following, if true, most seriously undermines the attorney's argument in defense of TEB? ______

单选题13. Observations of the Arctic reveal that the Arctic Ocean is covered by less ice each summer than the previous summer. If this warming trend continues, within 50 years the Arctic Ocean will be ice free during the summer months. This occurrence would in itself have little or no effect on global sea levels, since the melting of ice floating in water does not affect the water level. However, serious consequences to sea levels would eventually result, because ______. Which of the following most logically completes the passage? ______

单选题. ①Marine ecosystems certainly have less permanence than terrestrial ecosystems. ②Ashore, ecologists are not confronted with shifting ecological discontinuities, or with changes in the characteristic conditions of individual ecosystems, because, unless man intervenes, the tree line on a mountain or the passage between grassland and savannah remains approximately static over a human lifetime. ③It is only on the millennial scale that such boundaries migrate significantly, or that characteristic regional ecosystems disappear. ④Urban sprawl, deforestation, overgrazing, and intensive agriculture are accomplishing in a few decades what nature cannily do in centuries, but that sad fact does not alter the argument. ⑤Although the human population explosion can produce pressures that rapidly shift ecological boundaries and modify ecosystems ashore, it is paradoxically more difficult directly to modify the average locations of the ephemeral and shifting ecological boundaries of the sea. ⑥We can accomplish this only indirectly by atmospheric modification, resulting in a changed global climate and a shifted ocean circulation.40. The primary purpose of the passage is to ______

单选题Quantity A: the standard deviation of x-3, x-2, x-1, x, x+1, x+2Quantity B: the standard deviation of y-3, y-2, y, y+1, y+2

单选题 ①W.E

单选题. ①Jane Austen's relationship to Romanticism has long been a vexed one. ②Although her dates (1775-1817) place her squarely within the period, she traditionally has been studied apart from the male poets whose work defined British Romanticism for most of the twentieth century. ③In the past her novels were thought to follow an Augustan mode at odds with the Romantic ethos. ④Even with the advent of historicist and feminist criticism, which challenged many previous characterizations of Austen as detached from the major social, political and aesthetic currents of her time, she continued to be distinguished from her male contemporaries. ⑤Jerome McCann, for example, insists that Austen does not espouse the Romantic ideology. ⑥Anne Mellor declares that Austen, along with other "leading women intellectual and writers of the day" "did not", participate in the Romantic "spirit of the age" but instead embraced an alternative ideology that Mellor labels "feminine Romanticism". ①To be sure, some critics throughout the years have argued for Austen's affinities with one or more of the male Romantic poets. ②A special issue of the Wordsworth Circle (Autumn 1976)was devoted to exploring connections between Austen and her male contemporaries. ③Clifford Siskin in his historicist study of Romanticism argued that Austen does participate in the same major innovation, the naturalization of belief in a developing self, as that characterized in Wordsworth's poetry and other key works from the period. ④Recently, three books have appeared (by Clara Tuite, William Galperin, and William Deresiewicz) that in various ways treat Austen as a Romantic writer and together signal a shift in the tendency to segregate the major novelist of the age from the major poets. ①The present essay seeks to contribute to this goal of firmly integrating Austen within the Romantic movement and canon. ②It does so by pointing out affinities between Austen and a writer with whom she has not commonly been associated, John Keats. ③Most comparisons of Austen and the Romantic poets have focused on Wordsworth and Byron, whose works we know she read. ④Although Austen could not have read Keats's poems, which only began to appear in print during the last years of her life, and there is no evidence that Keats knew Austen's novels, a number of important similarities can be noted in these writers' works that provide further evidence to link Austen with the Romantic movement, especially the period of second-generation Romanticism when all of her novels were published.1. The primary purpose of the passage is to ______

单选题. ①Biologists have long debated about whether egg production in birds is biologically highly costly, some theorizing that egg production is energetically or nutritionally demanding. ②Lack, however, suggested that clutch size—the number of eggs a bird lays per breeding cycle—is far below the potential limit of egg production. ③He suggested that clutch size had instead evolved in relation to the number of young that the parents could successfully rear. ④Subsequently, most studies focused on limitations operating during chick rearing, particularly among altricial species (species in which the parents feed their young in the nest). ⑤Lack later recognized that in precocial species (species in which young feed themselves), clutch size might be explained by different factors—the availability of food for egg-laying females, for example.48. The passage suggests that biologists who say egg production in birds is biologically highly costly would agree that clutch size is determined primarily by ______

单选题If x, y and z are different positive integers less than 10, what is the greatest possible value of x-yz?

单选题. ①The finding that there were rock-melting temperatures on asteroids for sustained periods is puzzling: asteroids' heat source is unknown, and unlike planet-sized bodies, such small bodies quickly dissipate heat. ②Rubin suggests that asteroids' heat could have derived from collisions between asteroids. ③Skeptics have argued that a single impact would raise an asteroid's overall temperature very little and that asteroids would cool too quickly between impacts to accumulate much heat. ④However, these objections assumed that asteroids are dense, solid bodies. ⑤A recent discovery that asteroids are highly porous makes Rubin's hypothesis more plausible. ⑥When solid bodies collide, much debris is ejected, dissipating energy. ⑦Impacts on porous bodies generate less debris, so more energy goes into producing heat. ⑧Heat could be retained as debris fall back into impact craters, creating an insulating blanket.17. The passage suggests that one factor that has made it difficult to account for the temperatures once reached by asteroids is ______

单选题16. The immune systems of hamsters injected with laboratory cultures of Borrelia burgdorferi, the bacterium that causes Lyme disease, respond differently than do the immune systems of people infected with the bacterium as a result of the bites of ticks, the disease's carrier. However, when hamsters are infected with the bacterium by tick bites, their immune-system response is identical to the human one. Probably, therefore, the bacterium in the ticks has a different form from the bacterium cultured in the laboratory. The argument in the passage assumes which of the following? ______

单选题The ratio of girls to boys in a class is 3 to 4. If there are a total of 28 students in the class, how many girls are there?

单选题. ①The most dramatic changes that took place during the seventeenth century in French culinary techniques concern seasoning. ②The strong flavors of the Middle Ages still had some adherents but were increasingly rejected in favor of sauces made with fat, which were thought to preserve more natural flavor. ③While spices still figured in about two-thirds of recipes, a proportion just as high as in the Middle Ages, they were used more sparingly. ④This statement is difficult to prove on the basis of cookbooks alone, because recipes were still imprecise. ⑤However, there are the reports of French travelers, who complained of foreign cooking too spicy to eat. ⑥Such complaints, which do not appear until the mid-seventeenth century, attest to a change of sensibilities.33. According to the passage, during the seventeenth century the French increasingly developed a taste for ______

单选题33. Editors of major United States newsmagazines have been criticized for reducing the amount of space these magazines devote to international news. According to these editors, however, readers are wholly to blame for the reductions. After all, the editors point out, sales of magazine issues that prominently feature international news stories have declined significantly, and declining sales reflect declining reader interest. Yet even if true, this evidence does not refute the contention that editors are merely passive instruments responding to reader interest. And that is clearly an untenable view, since editors can often intensify reader interest in a news topic by giving it frequent coverage. In the argument as a whole, the two highlighted portions play which of the following roles? ______

单选题下面哪一个不可能为多少天的小时数目?

单选题. ①Wildcats are improbable candidates for domestication. ②Like all felids [cats], wildcats are obligate carnivores, meaning they have a limited metabolic ability to digest anything except proteins. ③Wildcats live a solitary existence and defend exclusive territories, making them more attached to places than to people. ④Furthermore, cats do not perform directed tasks and their actual utility is debatable; even as mousers, in this latter role, terrier dogs and ferrets are preferable. ⑤Accordingly, there is little reason to believe an early agricultural community would have sought out and selected the wildcat as a house pet. ⑥Rather, the best inference is that wildcats exploiting human environments were simply tolerated by people and, over time and space, they gradually diverged from their ''wild" relatives.14. The author would most likely agree that in early agricultural communities cats would have been ______