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45. Some anthropologists study modern-day societies of foragers in an effort to learn about our ancient ancestors who were also foragers. A flaw in this strategy is that forager societies are extremely varied. Indeed, any forager society with which anthropologists are familiar has had considerable contact with modern, non-forager societies. Which of the following, if true, would most weaken the criticism made above of the anthropologists' strategy? (A) All forager societies throughout history have had a number of important features in common that are absent from other types of societies. (B) Most ancient forager societies either dissolved or made a transition to another way of life. (C) All anthropologists study one kind or another of modern-day society. (D) Many anthropologists who study modern-day forager societies do not draw inferences about ancient societies on the basis of their studies. (E) Even those modern-day forager societies that have not had significant contact with modern societies are importantly different from ancient forager societies. 关于C选项,有一点点小疑问,这个选项说的是所有的学者都研究一种类型的MD社会,那么能不能判断这个选项为,显示因果的资料不正确?(或者是不具有代表性?) 另外,这个题目的名词好多,。有modern-day forager society ,modern non-forager society 和forager society,有点晕,想请NN帮帮忙,帮我写一下推理链,我怎么都理不出头绪、、、 51. One variety of partially biodegradable plastic beverage container is manufactured from small bits of plastic bound together by a degradable bonding agent such as cornstarch. Since only the bonding agent degrades, leaving the small bits of plastic, no less plastic refuse per container is produced when such containers are discarded than when comparable nonbiodegradable containers are discarded. Which of the following, if true, most strengthens the argument above? (A) Both partially biodegradable and nonbiodegradable plastic beverage containers can be crushed completely flat by refuse compactors. (B) The partially biodegradable plastic beverage containers are made with more plastic than comparable nonbiodegradable ones in order to compensate for the weakening effect of the bonding agents. (C) Many consumers are ecology-minded and prefer to buy a product sold in the partially biodegradable plastic beverage containers rather than in nonbiodegradable containers, even if the price is higher. (D) The manufacturing process for the partially biodegradable plastic beverage containers results in less plastic waste than the manufacturing process for nonbiodegradable plastic beverage containers. (E) Technological problems with recycling currently prevent the reuse as food or beverage containers of the plastic from either type of plastic beverage container.
正确答案是B。这个题目好无奈啊,完全没有看懂题目是什么意思,没有看懂它的表述,如果可以,谁能帮帮我,告诉我它大概表述了什么意思?。。。 B是正确答案,至于这个推理,更加是晕,请NN帮忙解释一下了~~拜托了 59. In order to withstand tidal currents, juvenile horseshoe crabs frequently burrow in the sand. Such burrowing discourages barnacles from clinging to their shells. When fully grown, however, the crabs can readily withstand tidal currents without burrowing, and thus they acquire substantial populations of barnacles. Surprisingly, in areas where tidal currents are very weak, juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow. Which of the following, if true, most helps to explain the surprising finding? (A) Tidal currents do not themselves dislodge barnacles from the shells of horseshoe crabs. (B) Barnacles most readily attach themselves to horseshoe crabs in areas where tidal currents are weakest. (C) The strength of the tidal currents in a given location varies widely over the course of a day. (D) A very large barnacle population can significantly decrease the ability of a horseshoe crab to find food. (E) Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year.
正确答案是E.这个题目基本上都看懂了,就是对于junvenile和fully grown有点疑惑,因为我觉得这是两个不同的概念,而貌似OG的解释中把他们当做同一个概念了,文章最后一句话说:juvenile horseshoe crabs are found not to have significant barnacle populations, even though they seldom burrow.而正确选项说Until they are fully grown, horseshoe crabs shed their shells and grow new ones several times a year。 这是不是指这是两个相同的概念?还是有别的理解方式?
[此贴子已经被作者于2009/10/31 19:46:33编辑过] |