单选题某电子设备厂生产的计算器有25％是不合格的，910不合格的计算器被检验出来后扔掉；并且有15合格的计算器被错误地扔掉。假设所有未扔掉的计算器都被出售，该电子设备厂出售的计算器中有百分之几是不合格的?

单选题If p＞q＞w＞r and p-q＞m m＞0, p and q are odd integers, w, r and m are even integers, then the least possible value ofp-ris?

单选题There are 40 different positive integers in List A, if all the integers in List A are the multiples of a positive integer n, and the largest number in the list is 240.Quantity A: nQuantity B: 4

单选题6. There are many structural and thematic similarities between Piers Plowman by Langland (1330-1400) and House of Fame by Chaucer (1342-1400), two Middle English poems relating dream visions. Some critics have argued that because a number of the shared elements are uncommon in Middle English poetry, and because Langland's poem probably predates Chaucer's by a few years, Chaucer was most likely influenced by Piers Plowman when writing House of Fame. Which of the following, if true, most seriously weakens the critics' argument? ______

单选题. ①Certain practices common in the early United States make it easy for historians to underestimate the extent of American women's paid labor. ②Under the legal principle called coverture, married women had no legally recognized economic existence apart from their husbands and could not receive wages for their work. ③Records of payments for outwork (work performed in the home on a piece-rate basis) show male names as wage recipients. ④One has to look in the columns recording the amount of work completed to see that female names are listed as producers. ⑤Furthermore, most wage laborers were paid partly in goods and received cash wages only quarterly or once or twice a year. ⑥The infrequency of such payments has sometimes made it difficult for historians to recognize them as wages.11. According to the passage, payments to wage laborers in the early United States were ______

单选题. ①Early naturalists believed two species of beaver lived in North America: dam beavers and bank beavers. ②The bank species was thought to resemble the muskrat in behavior, living in burrows or lodges and unable to build dams. ③In fact, dams are primarily a strategy for dealing with annual variations in water levels. ④If water levels fall in summer, as they do in most of North America, then beavers lodge entrances may be exposed. ⑤With stabilized water levels, their homes are much safer. ⑥Along deep rivers, where bank beavers are found, this problem seldom arises. ⑦But these beavers do know how to build dams, and do so if the need arises, as may occur if they are forced to relocate after felling and consuming all nearby trees.36. The passage provides support for which of the following statements about beaver dams? ______

单选题 When on an airplane

单选题In a rectangular coordinate system, the set of all points x, y such that x2+y2＜1 comprises

单选题30. Scientists typically do their most creative work before the age of forty. It is commonly thought that this happens because aging by itself brings about a loss of creative capacity. However, studies show that a disproportionately large number of the scientists who produce highly creative work beyond the age of forty entered their field at an older age than is usual. Since by the age of forty the large majority of scientists have been working in their field for at least fifteen years, the studies' finding strongly suggests that the real reason why scientists over forty rarely produce highly creative work is not that they have simply aged but rather that they generally have spent too long in a given field. In the argument given, the two portions in boldface play which of the following roles? ______

单选题. ①Having a larger assortment to choose from increases consumers' expectations about matching their preferences. ②The heightened expectations seem logical, since assortments containing more or more varied items should increase the degree to which preferences can be matched. ③In practice, however, as assortment size increases, the degree to which consumers realize better preference matches often rises relatively little. ④Larger assortments may not actually offer more variety, the market may simply not supply an envisioned offering, or in the absence of sophisticated search tools, consumers may miss a better preference match even if it is available. ⑤Therefore, larger assortments can increase the likelihood that expectations will not be met, leaving consumers less satisfied with options chosen from larger rather than smaller assortments.14. In the highlighted portion of the passage, the author assumes that ______

单选题. ①A widespread concern in early eighteenth-century Britain that the institution of marriage was deteriorating into a mere business agreement, a cynical means of increasing wealth, was reflected in the media of the time. ②In the theater, for example, the Restoration comedy of manners, with its celebration of libertinism and portrayal of marriage as a social, and therefore artificial, institution, gave way to sentimental comedies like The Conscious Lovers, which celebrated the pure, instinctive love of its central characters while downplaying matters of wealth and status. ③New periodicals, such as the wildly popular Spectator, devoted many issues to the evils of mercenary marriages and to the glories of choosing love over money. ①However, the very popularity of such works calls into question the existence of any real trend toward mercenary marriage. ②Admittedly, the growing use and complexity of marriage settlements (the transfer of family property from one generation to the next upon a daughter's marriage) during this period meant that among the elite, at least, marriage contracts looked increasingly like business contracts. ③However, it should be noted that marriage had long been used by the elite to cement political or social bonds and to enhance family wealth.23. The primary purpose of the passage is to ______

单选题If a solid pyramid has 4 vertices and 4 faces, how many edges does the pyramid have?

单选题. ①The cycle of fluctuation in snowshoe hare populations is unusual among animal species in that it is remarkably regular—peaking every eight to eleven years—and broadly synchronized over a vast area. ②Declines from peak levels are initiated by markedly lower overwinter survival of young hares, sharp decreases in birth rates, and a declining survival rate for adult hares. ③The onset of population increases is brought about by greatly improved rates of survival and birth. ①Some biologists hypothesize that the cycle begins when peak snowshoe hare populations exceed their winter food supply; resulting malnutrition triggers a population decline. ②As hare numbers fall, the ratio of predators to hares increases, as does the impact of predation on the hare population. ③This extends the decline beyond the period of winter food shortage. ④Hare scarcity then causes predator population declines, and with fewer predators and more abundant winter food, the hare population begins another cyclic increase. ⑤The high mobility of predators responding to local differences in hare abundance contributes to interregional synchrony.33. The passage suggests that population fluctuations in many other animal species differ from those of the snowshoe hare in that population fluctuations in other species ______

单选题 ①Zora Neale Hurston's 1942 autobiography

单选题. ①Some historians have recently challenged the "party period paradigm," the view, advanced by McCormick and others, that political parties—especially the two major parties—in the United States between the years 1835 and 1900 evoked extraordinary loyalty from voters and dominated political life. ②Voss-Hubbard cites the frequency of third-party eruptions during the period as evidence of popular antipathy to the two-party regime. ③He correctly credits third parties with helping generate the nineteenth century's historically high rates of voter turnout by forcing major parties to bolster supporters' allegiance, lest minor parties siphon off their votes, and with pushing policy demands that the major parties ignored. ④Formisano stresses the pervasive record of nonpartisan and anti-party governance at the local level, and women's frequent participation in nineteenth-century public life, prior to their enfranchisement, in nonpartisan and antiparty ways as evidence of the limitations of the party period paradigm. ⑤Yet McCormick would deny that the existence of antiparty sentiment during the period undermined the paradigm, since he has always acknowledged the residual strength of such sentiment during the nineteenth century. ⑥In any case, the strength of the paradigm is its comparative thrust: the contrast it draws between the period in question and earlier and later political eras.24. The primary purpose of the passage is to ______

单选题 In an experiment

单选题 ①From the 1880s to the 1930s

单选题. ①While historian Linda Nicholson sees women's participation in voluntary associations as activities consistent with the increasing relegation of women's lives to a separate, "private" sphere in nineteenth-century Europe, historian Katherine Lynch argues that these kinds of activities enabled women to join with one another and to develop a kind of shadow citizenship within civil society, if not the formal state. ②These kinds of experiences were no substitute for actual political entitlements, Lynch suggests, but they deserve more attention for their importance in helping individuals forge enduring bonds of community and identity beyond domestic life. ③Only by limiting one's notion of public life to formal political participation, she says, can one conclude that most women in Western society have ever been literally consigned to a separate or "private" sphere.31. The phrase "These kinds of experiences" in the passage refers to experiences in Lynch's view are ______

单选题16. A hoard of coins recently unearthed at an ancient Carthagian site bear an image of a face in profile with what appears to be a large mole on the cheek. Pointing out that an artist would be unlikely to include such a specific detail in a generalized portrayal of a face, some archaeologists have concluded that these coins portray an actual individual rather than an idealized type. However, this conclusion is unwarranted, since ______. Which of the following most logically completes the argument? ______