单选题. ①The main exception to primate researchers' general pattern of ignoring interactions between males and infants has been the study of male care among monogamous primates. ②It has been known for over 200 years, ever since a zoologist-illustrator named George Edwards decided to watch the behavior of pet marmosets in a London garden, that among certain species of New World monkeys males contributed direct care for infants that equaled or exceeded that given by females. ③Mothers among marmosets and tamarins typically give birth to twins, as often as twice a year, and to court the female in her staggering reproductive burden the male carries the infant at all times except when the mother is actually suckling it. ④It was assumed by Kleiman that monogamy and male confidence of paternity were essential to the evolution of such care, and at the same time, it was assumed by Symons and others that monogamy among primates must be fairly rare. ①Recent findings, however, make it necessary to reverse this picture. ②First of all, monogamy among primates turns out to be rather more frequent than previously believed (either obligate or facultive monogamy can be documented for some 17-20 percent of extant primates) and second, male care turns out to be far more extensive than previously thought and not necessarily confined to monogamous species, according to Hrdy. ③Whereas previously, it was assumed that monogamy and male certainty of paternity facilitated the evolution of male care, it now seems appropriate to consider the alternative possibility, whether the extraordinary capacity of male primates to look out for the fates of infants did not in some way pre-adapt members of this order for the sort of close, long-term relationships between males and females that, under some ecological circumstances, leads to monogamy! ④Either scenario could be true. ⑤The point is that on the basis of present knowledge there is no reason to view male care as a restricted or specialized phenomenon. ⑥In sum, though it remains true that mothers among virtually all primates devote more time and/or energy to rearing infants than do males, males nonetheless play a more varied and critical role in infant survival than is generally realized.37. The author the passage mentions the work of Hrdy primarily to ______

单选题21. Almost all forms of large-scale electric power generation pollute the environment; the less electric power consumed, therefore, the less pollution created. Ordinary refrigerators account for 15 percent to 25 percent of the average United States household's annual electric power consumption, but energy efficient refrigerators use 20 percent to 30 percent less electricity than ordinary refrigerators. If the information above is correct, which of the following conclusions does it best support? ______

单选题 ①In the late nineteenth century

单选题the average of n consecutive integers beginning with 1 is 12Quantity A: nQuantity B: 24

单选题2. The Rivera Art Museum recently began charging admission. The resulting decline in visitors has been far larger than at other local museums, which have also begun charging admission. The magnitude of the decline might be due to the Rivera's location near government offices. Because an admission charge is most discouraging to those who plan a short visit, it is likely that government workers who formerly made brief visits during lunchtime and after work now do not. Which of the following, if true, most seriously undermines the proposed explanation? ______

单选题 ①According to the prevailing view, Homo erectus

单选题 The surface of Venus contains calcite

单选题. ①Migratory songbirds breeding in Eurasia's temperate forests depend on a summer flush of insects, particularly caterpillars, to feed themselves and their offspring. ②In some places, these caterpillars are emerging earlier in responses to rising global temperatures. ③In theory, the songbird could simply push up their departure from their winter quarters to catch the earlier flush of insect prey. ④If, however, the birds rely on a fixed cue such as increasing day length to begin flying north, they may be unable to adjust the timing of their migration. ⑤Precisely this disruption in the emergence of insects relative to the timing of songbird migration has been identified as the cause of a significant decline in populations of pied flycatchers in the Netherlands.25. The primary function of the highlighted sentence is to ______

单选题Quantity A: 111+112+113+114+115Quantity B: 13

单选题 ①Hotter and more massive than the Sun

单选题 ①Arctic sea ice comes in two varieties

单选题4个*号和2个?号一共能够组成多少种可能的密码?

单选题PQ is the diameter of the circle with center O 6,0 and the coordinates of polar P is 3, 2Quantity A: the coordinate of point QQuantity B: 9,-2

单选题 Members of the San, a hunter-gatherer society

单选题. ①Widespread climate change challenges traditional notions that preserving specific chunks of land is an adequate way to protect endangered species. ②Commitment to particular places has taken conservation a long way, but it works only when the climate is relatively stable. ③When climate change rather than degraded habitat threatens a species' survival in a particular location, moving the species to new locales might become one way of preserving it. ④Some ecologists argue that such assisted migration is simply a way to mimic the natural process of dispersal: its adherents intend to transport species from places that have become uninhabitable through places that humans have made impassable. ⑤Although it has its risks, assisted migration may be a necessary step in the evolution of conservation.18. The author of the passage implies that some endangered species are unlikely to migrate naturally to habitats better suited to their survival because ______

单选题Which of the following CANNOT be expressed as the product of exactly 3 consecutive positive integers?

单选题Quantity A: the shortest distance between the line x+y=3 and 2x+2y=4Quantity B: 1

单选题Select 3 people from 4 couples to form a group. Two people of one couple can not be selected at the same time. How many ways of selection are there?

单选题. ①Much recent work has examined the claim that women encounter increasing obstacles relative to men as they move up the organizational ladder in business. ②This proposition, which we term the increasing-disadvantage model, is a core element of the popular glass ceiling metaphor. ③Despite continued widespread public acceptance of the glass ceiling idea and some consistent findings, most research to date has failed to support the increasing-disadvantage model. ④Indeed, several studies based on private-sector firms find that women's mobility prospects improve, rather than decline, as they climb upward in corporate hierarchies. ⑤In the public sector, researchers have found either no sex differences in mobility or a larger female disadvantage in lower grades. ①Comparing cross-sectional national samples of workers, Baxter and Wright found no evidence in the United States, and only limited evidence in Sweden and Australia, that women's probability of being located in a higher versus a lower hierarchical level declined relative to men's at higher levels. ②Taken together, these findings suggest that the glass ceiling may be a myth. ③Women's scarcity in top organizational ranks may simply represent the cumulative effect of a constant-or even decreasing-disadvantage at successive hierarchical levels.5. The primary purpose of the passage is to ______