单选题If an integer n is divisible by both 12 and 15, it must also be divisible by which of the following?

单选题 ①Historically

单选题. ①Current studies of early modern absolutism—rule by one person with absolute authority—emphasize continual negotiations between ruler and ruled. ②The rulers who often staged spectacular displays of their might spent much of their time arranging deals and forestalling opposition, negotiating constantly with nobles and others for acceptance of their rule. ③The effective ruler was not the one who brusquely subdued opponents, but the one who both avoided antagonizing those opponents who could not be easily subdued and who gradually lured most others into his court with political appointments. ④The rule of Cosimo I de' Medici, a sixteenth-century duke of Tuscany, exemplifies this strategy. ⑤Beginning from a weak position, Cosimo became one of Europe's most powerful rulers, founding a dynasty that lasted well beyond his lifetime.1. Which of the following actions by a ruler would best serve as an example of the "strategy" referred to in the passage? ______

单选题. ①The first printers in Europe modeled their books very closely on handwritten manuscripts, leading to an easy acceptance of print among readers but to significant missteps in trying to apply technology. ②The attempt to replicate manuscripts' appearance encouraged experiments in two- or three-color printing. ③This was intricate and expensive work, and many printers found it preferable to pay expert calligraphers to manually adorn unbound sheets with additional colors. ④Illuminated headings and decoration familiar from the manuscript age had helped lead readers through the text. ⑤To achieve similar effects, printers began to experiment with new arrangements of type, using large fonts for headings and substituting decorative woodcuts for hand-executed initial letters. ⑥Ultimately, readers came to accept books printed in just one color.27. The author suggests that readers of the earliest books printed in Europe ______

单选题. ①Our terrestrial food supply comes from ecosystems transformed to produce a few comestible species through the removal of competitors, predators, and pests, but marine capture fisheries depend on the overall productivity of natural ecosystems. ②There is, however, increasing concern about the impact of fishing and other human activities on marine ecosystems, which are now far from pristine. ③One option for moving toward both biodiversity and terrestrial food supply goals is to produce greater yields from less land, thereby freeing land for conservation purposes. ④By contrast, the objective of maintaining or resorting the biodiversity of marine ecosystems may conflict with the objective of maintaining or increasing our food supply from the sea, since the level of fishing required to achieve the latter may compromise the former.21. The primary purpose of the passage is to ______

单选题 ①One way to assess This is the American Earth

单选题. ①The manuscripts of the eight extant Latin tragedies identify the plays as the Marci Lucii Annei Senecae Tragoediae. ②Since nobody of that name is known, modern scholars believe the dramas to be the work of Lucius Annaeus Seneca the Younger, the well-known philosopher, orator and politician. ③Clearly the tragedies were written during Seneca's lifetime: internal references to earlier poets, most notably Ovid, indicate that the dramas cannot have been composed prior to the second decade C.E., and the plays must have been written by 96C.E., when Quintilian quotes Medea, one of the tragedies. ①It is remarkably, however, that Seneca himself never mentions the plays, since there are certain passages in them that could be used to illustrate points of his philosophy. ②There are at least two possible explanations. ③In the early Roman Empire, playwrights were sometimes exiled or executed for line constructed as directed against the emperor; thus, Seneca's silence may be simple prudence. ④But if anyone could safely attach his name to dramas, surely it would be Seneca, the emperor's tutor. ⑤And although Herrmann offers Seneca's modesty as an explanation, Seneca is not averse to referring to his other writings. ⑥The evidence for equating Seneca with the author of the tragedies seems circumstantial.8. The author mentions Medea primarily in order to ______

单选题x is selected from set X {-1, 3, 6} and y is selected from set Y{-2, 4, 5, 7}Quantity A: the probability that yx will be positiveQuantity B: 56

单选题Quantity A: xQuantity B: y

单选题. ①1800 Thomas Dilworth's New Guide to the English Dialogue was being widely used to teach reading in the United States. ②Dilworth's primer, unlike earlier ones, stressed the importance of children's understanding what they read. ③While it is in fact unlikely that children would have recognized all the vocabulary Dilworth used, that was at least his stated goal. ④Dilworth recognized that primers should enable children to decode words from print with the form of language they already knew: speech. ⑤In contrast, many earlier authors assumed that, just as introductory Latin texts taught children an unknown language, introductory English texts should teach English as if it, too, were an unknown language—such as their esoteric choice of vocabulary, it in effect became unknown.39. According to the passage, the "earlier authors" adopted a model for English instruction that ______

单选题Quantity A: 1100+199+198+197+196Quantity B: 120

单选题. ①There is mounting evidence that the frequency and magnitude of landsliding is changing in many parts of the world in response to climate change. ②This is not surprising, given that precipitation is one of the two external triggering mechanisms—the other being seismic activity—involved in the formation of landslides. ③Evidence from the past clearly indicates that cycles of elevated landslide activity have been followed by cycles of low activity, and that these are correlated with climate fluctuations over a variety of timescales. ①What sets current changes in landslide activity apart is the likely influence of anthropogenic [i.e., human-caused] factors, either acting alone or in concert with climate, which can further modify the process of landsliding and the nature of ecosystem responses. ②Among these factors, deforestation and land-use change have the potential to influence the frequency and magnitude of landsliding because of their direct effects on vegetation attributes that influence slope stability. ③The extent and conditions under which mountain ecosystems are resilient to these changes—that is, the amount of disturbance they can absorb before changing into states with different structure and function—are not known. ④Addressing this issue is crucial for the long-term conservation of mountainscapes.7. The author of the passage cites "evidence from the past" in order to ______

单选题x2=81Quantity A: xQuantity B: 8

单选题All the three sides of one quadrangle are 3Quantity A: the fourth side of the quadrangleQuantity B: 3

单选题. ① Received feminist wisdom has conceived of history as a male enclave devoid of woman subjects and practitioners, particularly before the twentieth century. ②As Ann For Freedom put it in 1972, from Herodout's to Will Durant's histories, the main characters, the main viewpoints and interests, have all been male. ③Feminist accounts of the 1970s and 1980s viewed historiography (the writing of history) as overwhelmingly his, coining the term herstory and presenting it as a compensatory feminist practice. ④Herstory designated women's place at the center of an alternative narrative of past events. ⑤Rosalind Miles's description restates the popular view: Women's history by contrast has only just begun to invent itself. ⑥Males gained entry to the business of recording, defining and interpreting events in the third millennium B.C.; for women, this process did not even begin until the nineteenth century. ⑦The herstorical method provided a means for feminist historians to explore materials by and about women that had previously been neglected or ignored. ⑧Herstory promoted curricular transformation in schools and was used as a slogan on T-shirts, pencils, and buttons. ⑨Exposing historian's tacit and intentional sexism, herstorians set out to correct the record—to show that women had held up half the historical sky. ①Despite the great scholarly gains made behind the rallying cry, herstory's popular myth– particularly about the lack of women who have recorded history–require revision. ②Herstory may accurately describe feminists efforts to construct female-centered accounts of the past, but the term inadvertently blinds us to women's important contributions to historical discourse before the nineteenth century. ③Historiography has not been an entirely male preserve, though feminists are justified in faulting its long-standing masculine contours. ④In fact, criticism of historiography's sexism is not of recent origin. ⑤Early eighteenth-century feminist Mary Astell protested that the Men being the Historians, they seldom condescend to record the great and good actions of Women. ⑥Astell, like those who echoed her sentiments two and a half centuries later, must be credited for admirable zeal in setting out to right scholarly wrongs, but her supposition that historians were only male is inaccurate. ⑦Her perception is especially strange because she herself wrote a historical work, An Impartial Enquiry into the Cause of Rebellion and Civil War (1704). ⑧Astell's judgment is at the same time understandable, given that much historical writing by women of the late seventeenth century was not published until the nineteenth century. ⑨Despite their courage and their rightful anger, Astell and her descendants overlooked early modern woman writer's contributions to historiography.38. It can be inferred that Rosalind Miles refers to the third millennium B.C. primarily in order to ______

单选题29. Rain-soaked soil contains less oxygen than does drier soil. The roots of melon plants perform less efficiently under the low-oxygen conditions present in rainsoaked soil. When the efficiency of melon roots is impaired, the roots do not supply sufficient amounts of the proper nutrients for the plants to perform photosynthesis at their usual levels. It follows that melon plants have a lower-than-usual rate of photosynthesis when their roots are in rain-soaked soil. When the photosynthesis of the plants slows, sugar stored in the fruits is drawn off to supply the plants with energy. Therefore, ripe melons harvested after a prolonged period of heavy rain should be less sweet than other ripe melons. In the argument given, the two portions in boldface play which of the following roles? ______

单选题. ① Although social learning (the acquisition of specific behaviors by observing other individuals exhibiting those behaviors) is well documented among fish, few studies have investigated social learning within a developmental context in these taxa. ②Rather than investigating the development of a particular skill, Chapman, Ward, and Krause investigated the role of group density during development in later foraging success in laboratory-housed guppies. ③When raised with a small number of conspecifics (members of the same species), guppies were quicker to locate food by following a trained adult guppy than were guppies raised in large groups. ④This counterintuitive finding is explained by the fact that guppies reared in the high density condition were less likely to shoal (swim in a group) with others and, therefore, were less likely to learn the benefits of social learning. ⑤Instead, fish reared in high-density situations may learn that conspecifics are to be viewed as competitors, rather than as potential sources of adaptive information. ⑥This finding suggests that at least for guppies, the early social environment may have an effect on the capacity for social learning, if not on the socially learned behaviors themselves.32. The primary purpose of the passage is to ______

单选题Quantity A: 335999Quantity B: 110333

单选题从100到999inclusive中取出一个数，这个数中3个数字都相同的概率是多少?

单选题. ①Although many hypotheses have been proposed to explain why some plant communities are more susceptible than others to invasion by nonnative species, results from field studies have been inconsistent and no general theory of invasibility has yet emerged. ②However, a theory based on fluctuating resource availability could integrate most existing hypotheses and successfully resolve many of the apparently conflicting and ambiguous results of previous studies. ③The suggested theory is that a plant community becomes more susceptible to invasion whenever there is an increase in the amount of unused resources. ①The diversity in the range of resource-release mechanisms could partly explain the absence of consistent ecological correlates of invasibility. ②In particular, the theory predicts that there will be no necessary relationship between the species diversity of a plant community and its susceptibility to invasion, since nearcomplete exploitation can each occur in both species-rich and species-poor communities. ③Though Lonsdale found a positive association between species richness and invasion, this may arise from the tendency of diverse plant communities to be nutrient poor and therefore more responsive to the effects of human-caused influxes of nutrients.11. The passage is primarily concerned with ______