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{精练}3:00……还做错了，我的做题时间简直是让我很想打自己，提高阅读量加油！！！
5. Politician: All nations that place a high tax on
income produce thereby a negative incentive
for technological innovation, and all nations in
which technological innovation is hampered
inevitably fall behind in the international arms
race. Those nations that, through historical
accident or the foolishness of their political
leadership, wind up in a strategically
disadvantageous position are destined to lose
their voice in world affairs. So if a nation wants
to maintain its value system and way of life, it
must not allow its highest tax bracket to exceed
30 percent of income.
Each of the following, if true, weakens the
politician’s argument EXCEPT:
P：tax高——innnovation下降——竞赛落后——处于不利地位——因为这些愚蠢的领导或者历史原因——最终导致没有地位啊弱国无外交
C：因此要控制tax在30%以下
问 weaken except
(A) The top level of taxation must reach 45 percent
before taxation begins to deter inventors and
industrialists from introducing new
technologies and industries.——weaken了
(B) Making a great deal of money is an
insignificant factor in driving technological
innovation.——weaken了推论
(C) Falling behind in the international arms race
does not necessarily lead to a strategically
less advantageous position.——同B，weaken了推理
(D) Those nations that lose influence in the world
community do not necessarily suffer from a
threat to their value system or way of life.——同B
(E) Allowing one’s country to lose its
technological edge, especially as concerns
weaponry, would be foolish rather than
merely a historical accident.——这是正确答案，一开始我实在不知道选什么，所以选的D……求高人讲解
{PREP逻辑链练习}
1:24min
Urban air contains more sulfur dioxide than does rural air, and plants in cities typically grow more slowly than do plants in rural areas. In an experiment to see how much of the difference in growth is due to sulfur dioxide, classes in an urban and a rural school grew plants in greenhouses at their schools and filtered the greenhouse air to eliminate sulfur dioxide. lants in the urban greenhouse grew more slowly than those in the rural greenhouse.
Which of the following, if true, would it be most important to take into account in evaluating the result?
逻辑链：urban的二氧化硫含量比rural的高——urban的植物长得比rural的慢
为了证明这个是不是二氧化硫的原因我们做了实验，就是把植物放在没有二氧化硫的地方培育——结果是urban的比rural的更慢
问评估，就是求解释
思路：说明不是二氧化硫的原因，会有别的影响到了
(A) The urban school was located in a part of the city in which levels of sulfur dioxide in the air were usually far lower than is typical for urban areas.——不管你们的事，排除
(B) At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouses.——也不管实验的事情，排除
(C) The urban class conducting the experiment was larger than the rural class conducting the experiment.——实验大小跟长得慢没有关系啊，排除
(D) Heavy vehicular traffic such as is found in cities constantly deposits grime on greenhouse windows, reducing the amount of light that reaches the plants inside.——bingo！他因，阳光的照射，而且逻辑链长得很严谨
(E) Because of the higher levels of sulfur dioxide in the air at the urban school, the air filters for the urban school's greenhouse were changed more frequently than were those at the rural school.——过滤器的转换不影响二氧化硫渗入温室就可以看了，管你换的快不快
18. 1:21min
Many small roads do not have painted markings along their edges. Clear edge markings would make it easier for drivers to see upcoming curves and to judge the car's position on the road, particularly when visibility is poor, and would therefore seem to be a useful contribution to road safety. However, after Greatwater County painted edge markings on all its narrow, winding roads, the annual accident rate along those roads actually increased slightly.
Which of the following, if true, most helps to explain the increase in accident rate?
逻辑链：小路无边线——边线可以让司机更好的定位——更安全——但是当画了边线以后——交通事故反而多了
问explain
思路：因果因为划了线——所以安全——但现在不安全，找可以改变因的一个因素
(A) Greatwater County has an unusually high proportion of narrow, winding roads——说路的属性，无关.
(B) In bad weather it can be nearly as difficult for drivers to see the road as it is at night.——说天气的属性，无关
(C) Prior to the painting of the edge markings, Greatwater County's narrow, winding roads already had a somewhat higher accident rate than other Greatwater County roads.——这个是划线前后都会有的，排除
(D) Many of the accidents on narrow, winding roads involve a single vehicle veering off the road, rather than the collision of two vehicles.——一条线和两条线有啥区别……排除
(E) After the markings were painted on the roads, many drivers who had gone out of their way to avoid driving on those roads at night no longer did so.——bingo！划线导致对司机的影响，从而导致交通事故
19. 1:48min
Gortland has long been narrowly self-sufficient in both grain and meat. However, as per capita income in Gortland has risen toward the world average, per capita consumption of meat has also risen toward the world average, and it takes several pounds of grain to produce one pound of meat. Therefore, since per capita income continues to rise, whereas domestic grain production will not increase, Gortland will soon have to import either grain or meat or both.
Which of the following is an assumption on which the argument depends?
逻辑链：这个地方不缺肉和粮——人收入上升了——人均消费肉上升了—（—般好多磅粮食换肉）——所以如果人均收入再上升，产量还不上升就要进口肉和粮了
问假设
思路：人均消费肉上升了，粮有没有上升呢？如果粮没有上升甚至下降了，就不用进口粮了
(A) The total acreage devoted to grain production in Gortland will soon decrease.——无关
(B) Importing either grain or meat will not result in a significantly higher percentage of Gortlanders' incomes being spent on food than is currently the case.——质疑了前提，weaken了
(C) The per capita consumption of meat in Gortland is increasing at roughly the same rate across all income levels.——重复前提假设，不要
(D) The per capita income of meat producers in Gortland is rising faster than the per capita income of grain producers.——weaken
(E) People in Gortland who increase their consumption of meat will not radically decrease their consumption of grain.——bingo！取非，如果粮需求没有下降，直接不用进口了。
20. 1:21min
For years the beautiful Renaissance buildings in Palitito have been damaged by exhaust from the many tour buses that come to the city. There has been little parking space, so most buses have idled at the curb during each stop on their tour, and idling produces as much exhaust as driving. The city has now provided parking that accommodates a third of the tour buses, so damage to Palitito's buildings from the buses' exhaust will diminish significantly.
Which of the following, if true, most strongly supports the argument?
逻辑链：P这个地方的建筑被尾气污染严重——因为没有停车的地方所以旅游车到处转排放尾气——所以现在给三分之一的旅游大巴提供停车位——酱紫就能降低尾气污染
问加强
思路：为什么会有三分之一，而不是全部呢，选项中可能会提到这个，因为这个数字有点奇怪，一般的话停车位少与停车数量却能降低某个隐患的可能就是，高峰期问题和平均停车时间问题
(A) The exhaust from Palitito's few automobiles is not a significant threat to Palitito's buildings.——和automobile比较，无关
(B) Palitito's Renaissance buildings are not threatened by pollution other than engine exhaust.——跟原文结论没有相关性
(C) Tour buses typically spend less than one-quarter of the time they are in Palitito transporting passengers from one site to another.——bingo！因为旅游车变化的快，更替快，所以1/3的可以满足了！
(D) More tourists come to Palitito by tour bus than by any other single means of transportation.——这是weaken啊
(E) Some of the tour buses that are unable to find parking drive around Palitito while their passengers are visiting a site.——重复前提
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发表于 2013-10-20 22:14:38
