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This passage is excerpted from material published in 1997. Scientists have been puzzled by the seeming disparity between models of global warming based on greenhouse gas emissions and actual climatological data. In short, the world is not warming up as much as these models have predicted. In the early 1990s, Pat Michaels sought to explain this disparity, suggesting that sulfate emissions in industrial areas had a cooling effect, thus temporarily retarding global warming. Michaels later came to doubt this idea, however, pointing out that since most sulfate is emitted in the Northern Hemisphere, its cooling influence should be largely limited to that hemisphere. Yet, since 1987, warming in the Southern Hemisphere, which had been relatively intense, has virtually ceased, while warming in the north has accelerated. Thus, Michaels not only doubted the idea of sulfate cooling, but came to feel that global warming models themselves may be flawed.Ben Santer disagrees. Santer contends that, in general, global warming occurs more slowly in the south because this hemisphere is dominated by oceans, which warm more slowly than the landmasses that dominate the Northern Hemisphere. But, according to Santer, the situation remains complicated by sulfate cooling, which peaked in the north in the mid-twentieth century. It drastically slowed warming in the Northern Hemisphere, and warming in the Southern Hemisphere raced ahead. Since 1987, Santer argues, the greenhouse effect has reasserted itself, and the north has taken the lead. Thus, Santer disputes Michaels's claim that model predictions and observed data differ fundamentally.
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OG19-语文分册 OG20-语文分册
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According to the passage, Walker and Szalay disagree on which of the following points?
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OG19-语文分册 OG20-语文分册
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The passage suggests which of the following about the micro-wear patterns found on the teeth of omnivorous primates?
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OG19-语文分册 OG20-语文分册
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It can be inferred from the passage that Walker's conclusion about the australopithecine diet would be called into question under which of the following circumstances?
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OG19-语文分册 OG20-语文分册
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The primary purpose of the passage is to
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OG19-语文分册 OG20-语文分册
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The interview is an essential part of a successful hiring program because, with it, job applicants who have personalities that are unsuited to the requirements of the job will be eliminated from consideration.
The argument above logically depends on which of the following assumptions?
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Many leadership theories have provided evidence that leaders affect group success rather than the success of particular individuals. So it is irrelevant to analyze the effects of supervisor traits on the attitudes of individuals whom they supervise. Instead, assessment of leadership effectiveness should occur only at the group level.
Which of the following would it be most useful to establish in order to evaluate the argument?
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OG19-语文分册 OG20-语文分册
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A child learning to play the piano will not succeed unless the child has an instrument at home on which to practice. However, good-quality pianos, whether new or secondhand, are costly. Buying one is justified only if the child has the necessary talent and perseverance, which is precisely what one cannot know in advance. Consequently, parents should buy an inexpensive
secondhand instrument at first and upgrade if and when the child's ability and inclination are proven.
Which of the following, if true, casts the most serious doubt on the course of action recommended for parents?
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OG19-数学分册
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If $$x = - | W |$$, which of the following must be true?
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OG19-数学分册
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In the correctly worked addition problem shown, where the sum of the two-digit positive integers AB and BA is the three-digit integer
AAC,and A, B, and C are different digits, what is the units digit of the integer AAC?
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OG19-数学分册
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Planning is in progress for a fenced, rectangular playground with an area of 1,600 square meters. The graph above shows the perimeter, in meters, as a function of the length of the playground. The length of the playground should be how many meters to minimize the perimeter and, therefore, the amount of fencing needed to enclose the playground?
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OG19-数学分册
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If m is an even integer, v is an odd integer, and m > v > 0, which of the following represents the number of even integers less than m and greater than v ?
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OG19-数学分册
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On the number line, the shaded interval is the graph of which of the following inequalities?
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Seventeenthcentury philosopher John Locke stated that as much as 99 percent of the value of any useful product can be attributed to "the effects of labor."For Locke's intellectual heirs it was only a short step to the "labor theory of value,"whose formulators held that 100 percent of the value of any product is generated by labor(the human work needed to produce goods) and that therefore the employer who appropriates any part of the product's value as profit is practicing theft.Although human effort is required to produce goodsfor the consumer market, effort is also invested in making capital goods(tools, machines, etc.), which are used to facilitate the production of consumer goods. In modern economies about one-third of the total output of consumer goods is attributable tothe use of capital goods. Approximately two-thirds of the income derived from this total output is paid out to workers as wages and salaries, the remainingthird serving as compensation to the owners of the capital goods. Moreover, part of this remaining thirdis received by workers who are shareholders, pension beneficiaries, and the like. The labor theory of value systematically disregards the productive contribution of capital goods-a failing for which Locke must bear part of the blame.
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OG19-数学分册
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Of all the students in a certain dormitory, $$\frac{1}{2}$$ are first year students and the rest are second-year students. !f $$\frac{4}{5}$$ of the first-year students have not declared a major and if the fraction of second-year students who have declared a major is 3 times the fraction of first-year students who have declared a major, what fraction of all the students in the dormitory are· second-year students who have not declared a major?
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OG19-数学分册
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In the coordinate plane, line k passes through the origin and has slope 2. If points (3,y) and (x,4) are on line k, then $$x + y$$ =
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OG19-数学分册
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Jonah drove the first half of a 100-mile trip in x hours and the second half in y hours. Which of the following is equal to Jonah's average speed, in miles per hour, for the entire trip?
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OG19-数学分册
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What is the greatest number of identical bouquets that can be made out of 21 white and 91 red tulips if no flowers are to be left out? (Two bouquets are identical whenever the number of red tulips in the two bouquets is equal and the number of white tulips in the two bouquets is equal.)
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OG19-数学分册
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If the amount of federal estate tax due on an estate valued at $1.35 million is $437,000 plus 43 percent of the value of the estate in excess of $1.25 million, then the federal tax due is approximately what percent of the value of the estate?
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OG19-数学分册
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David used part of $100,000 to purchase a house. Of the remaining portion, he invested $$\frac{1}{3}$$ of it at 4 percent simple annual interest and $$\frac{2}{3}$$ of it at 6 percent simple annual interest. If after a year the income from the two investments totaled $320, what was the purchase price of the house?
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