单选题How many integers between 1 and 2,000 will be the square of an integer and also be the cube of an integer?

单选题. ①Recent studies of ancient Maya water management have found that the urban architecture of some cities was used to divert rainfall runoff into gravity-fed systems of interconnected reservoirs. ②In the central and southern May Lowlands, this kind of water control was necessary to support large populations throughout the year due to the scarcity of perennial surface water and the seasonal availability of rainfall. ③Some scholars argue that the concentration of water within the urban core of these sites provided a centralized source of political authority for Maya elites based largely on controlled water access. ④Such an argument is plausible; however, it is less useful for understanding the sociopolitical implications of water use and control in other, water-rich parts of the Maya region.47. The author of the passage implies which of the following about the political importance of the type of urban water management system described in the passage? ______

单选题. ①Was resource intensification—an increase in labor and time devoted to subsistence activities in order to increase food yields—by Dorset Paleo-Eskimos and Recent Indians on the island of Newfoundland simply a response to population pressure? ②Not exactly. ③On Newfoundland, population pressure did not result from a steadily growing resident population but, rather, from the arrival and lingering presence of new and significantly different populations. ④Newfoundland's hunter-gatherer populations—both resident and newcomer—adjusted to the presence of other populations through niche differentiation. ⑤Building on a tradition that emphasized marine resources, Dorset Paleo-Eskimos intensified their harvest of seals in response to the arrival of Recent Indians in the first few centuries A.D. ⑥Recent Indians who were more familiar with broad-based, interior-maritime adaptation, intensified this strategy to cope with the Dorset.41. According to the passage, which of the following resulted from the arrival of the Recent Indians? ______

单选题把0-15这16个数分别写在卡上放到一个盒子里，如果从这个盒子里无返回地取出卡片，问至少取出多少个数才能保证有两个卡片上的数目和是16?

单选题 Currently

单选题. ①Massive projectiles striking much larger bodies create various kinds of craters, including multi-ring basins–the largest geologic features observed on planets and moons. ②In such collisions, the impactor is completely destroyed and its material is incorporated into the larger body. ③Collison's between bodies of comparable size, on the other hand, have very different consequences: one or both bodies might be entirely smashed, with mass from one or both the bodies redistributed among new objects formed from the fragments. ④Such a titanic collision between Earth and a Mars-size impactor may have given rise to Earth's Moon. ①The Earth-Moon system has always been perplexing. ②Earth is the only one of the inner planets with a large satellite, the orbit of which is neither in the equatorial plane of Earth nor in the plane in which the other planets lie. ③The Moon's mean density is much lower than that of Earth but is about the same as that of Earth's mantle. ④This similarity in density has long prompted speculation that the Moon split away from a rapidly rotating Earth, but this idea founders on two observations. ⑤In order to spin off the Moon, Earth would have had to rotate so fast that a day would have lasted less than three hours. ⑥Science offers no plausible explanation of how it could have slowed to its current rotational rate from that speed. ⑦Moreover, the Moon's composition, though similar to that of Earth's mantle, is not a precise match. ⑧Theorizing a titanic collision eliminates postulating a too-rapidly spinning Earth and accounts for the Moon's peculiar composition. ⑨In a titanic collision model, the bulk of the Moon would have formed from a combination of material from the impactor and Earth's mantle. ⑩Most of the earthly component would have been in the form of melted or vaporized matter. ○11The difficulty in recondensing this vapor in Earth's orbit, and its subsequent loss to the vacuum of outer space, might account for the observed absence in lunar rocks of certain readily vaporized compounds and elements. ①Unusual features of some other planets might also be explained by such impacts. ②Mercury is known to have a high density in comparison with other rocky planets. ③A titanic impact could have stripped away a portion of its rocky mantle, leaving behind a metallic core whose density is out of proportion with the original ratio of rock to metal. ④A massive, glancing blow to Venus might have given it its anomalously slow spin and reversed direction of rotation. ⑤Such conjectures are tempting, but, since no early planet was immune to titanic impacts, they could be used indiscriminately to explain away in a cavalier fashion every unusual planetary characteristic; still, we may now be beginning to discern the true role of titanic impacts in planetary history.9. According to the passage, which of the following is true of the collisions mentioned in the highlighted sentence? ______

单选题. ①Because different mammalian species favor different environments, identifying and counting bones from prehistoric deposits in caves can reveal much about climatic changes. ②However, using large mammals' bones can be problematic. ③Some species, such as red deer, are very adaptable—at home both on open grassland and in thick woodland. ④Moreover, some large-animal bones may have traveled considerable distances before being discarded: both carnivores and humans can have large hunting territories and bring home large animals quite unlike those near their den or campsite. ⑤Consequently, the bones of the small mammals found within cave sediments provide a better index of climate change: they are generally more numerous, the species are more sensitive to environmental conditions, and few travel far within their short lives.39. The passage mentions which of the following as an obstacle to using animal bones to reconstruct past climate changes? ______

单选题Quantity A: p and q are two consecutive positive integers The remainder when the product of p, q is divided by 2Quantity B: 1

单选题有一个球从人行道上8米高的窗户处扔下，每一次反弹都是上一次下落距离的一半，求第五次反弹的高度?

单选题. ①A primary value in early twentieth-century Modernist architectural theory was that of "truth to materials", that is, it was essential that a building's design express the "natural" character of the building materials. ②This emphasis would have puzzled the architects of the Italian Renaissance (sixteenth century), a period widely regarded as the apex of architectural achievement, for Renaissance architects' designs were determined only minimally by the materials employed. ③The diversity of Italy's natural resources provided Renaissance architects with a wide variety of building materials. ④The builders of the Pitti Palace (1558-1570) used great blocks of Tuscan stone, just as Etruscans living in the same part of Italy had done some twenty centuries earlier. ⑤Had the Florentine Renaissance builders aped the Etruscan style, it might be said that their materials determined their style, since Etruscan style matched the massive, stark, solid character of the stone. ⑥But these same materials, which so suited the massive Etruscan style, were effectively used by the Florentine Renaissance to create the most delicate and graceful of styles. ①A similar example of identical materials used in contrasting styles characterizes the treatment of Roman travertine marble. ②When Baroque architects of seventeenth-century Rome desired a massive and solid monumental effect, they turned to travertine marble, whose "natural effect" is, indeed, that of spacious breadth and lofty, smoothly rounded surfaces. ③Yet during the Renaissance, this same material had been used against its "nature," in the Florentine tradition of sharply carved detail. ④Italian Renaissance architecture was shaped less by the "nature" of the materials at hand than by the artistic milieu of Renaissance Italy, which included painting and sculpture as well as architecture. ⑤While Roman travertine marble may have lent itself to fine carving, the Florentine passion for fine detail is no less marked in Florentine Renaissance painting than in Florentine Renaissance architecture. ⑥Similarly, in the next century, the emphasis on shading and corporeal density in Baroque painting mirrored the use of Roman travertine marble in Baroque architecture to create broad shadow and powerful masses. ①The ingenuity of Renaissance architects extended beyond merely using a material in a way not suggested by its outward natural appearance. ②If they conceived a design that called for a certain material either too expensive or difficult to work with, they made no scruple about imitating that material. ③Their marbles and their stones are often actually painted stucco. ④When the blocks of masonry with which they built were not in scale with the projected scheme, the real joints were concealed and false ones introduced. ⑤Nor were these practices confined, as some scholars insist, to the later and supposedly decadent phases of the art. ⑥Material, then, was utterly subservient to style.46. The passage is primarily concerned with ______

单选题the side of a rhombus is 10Quantity A: the shorter diagonal of the rhombusQuantity B: 8

单选题 ①In his recent book

单选题How many even integers are between 174 and 472?

单选题36. Cuts that need to be held closed in order to heal properly have generally been held closed with stitches. However, pressure to reduce medical costs is mounting. Consequently, it is likely that a newly developed adhesive will become the routine method of holding most types of cuts closed. The new adhesive holds most types of cuts closed as well as stitches do, and the cost of applying it is comparable to that of closing cuts with stitches. But whereas stitches must generally be removed by medical personnel after the cut has healed, the adhesive simply wears off. Thus, for any cut that the adhesive can hold closed as well as stitches can, it is more economical to use the adhesive. In the argument given, the two highlighted portions play which of the following roles? ______

单选题求在1至100的自然数中能够被3或者7整除的数的个数?

单选题For all real numbers x, the operation x* is defined by the equation x*=x+4, If x* *=10, then x=?

单选题A train travels from Beijing to Tianjin at an average rate of 40 miles per hour in the morning, and then comes back from Tianjin to Beijing at an average rate of 50 miles per hour at night.Quantity A:

单选题1. Even after numerous products made with artificial sweeteners became available, sugar consumption per capita continued to rise. Now manufacturers are introducing fat-free versions of various foods that they claim have the taste and texture of the traditional high-fat versions. Even if the manufacturers' claim is true, given that the availability of sugar-free foods did not reduce sugar consumption, it is unlikely that the availability of these fat-free foods will reduce fat consumption. Which of the following, if true, most seriously undermines the argument? ______

单选题数列按照1，2，2，3，3，3，4，4，4，4，5，…的规律一直排下去，which of the following is the 100th number?