Prior to here all are context in which the survey was conducted.
The result is a remarkable unbroken record of temperature and of atmospheric levels of carbon dioxide. Almost every time the chill of an ice age descended on the planet, carbon dioxide levels dropped. When the global temperature dropped 9°F (5 °C), carbon dioxide levels dropped to 190 parts per million or so.
Here the benchmark is set up, in which the correspondent relationship between atmospheric temperature and carbon dioxide level is described.
Generally, as each ice age ended and the Earth basked in a warm interglacial period, carbon dioxide levels were around 280 parts per million. Through the 160,000 years of that ice record, the level of carbon dioxide in the atmosphere fluctuated between 190 and 280 parts per million, but never rose much higher-until the Industrial Revolution beginning in the eighteenth century and continuing today.
Here more details are given and the question is extracted from this sector. Pay more attention to the bold & Italic & Underlined clause--if you paraphrase this clause, it equate to saying that during industrial period the temperature is the highest through history, which is phrased in answer A. In fact, it is the very principle indicated in OG for coping with reading questions.
There is indirect evidence that the link between carbon dioxide levels and global temperature change goes back much further than the glacial record. Carbon dioxide levels may have been much greater than the current concentration during the Carboniferous period, 360 to 285 million years ago. The period was named for aprofusion of plant life whose buried remains produced a large fraction of the coal deposits that are being brought to the surface and burned today.
The rest is nothing to do with question.
By the way, it's often normal that the reader makes one or two erros in reading an article. By this means I said 呵呵,迷迷糊糊好!. Actually, it's very difficult for anyone in limited time fully comprehending all the contents of an article. So for me, my philosophy is 迷迷糊糊好.
25.It can be inferred from the passage that brain size is assumed to
(A)be an indicator of cognitive ability
(B)vary among individuals within a species
(C)be related to food consumption
(D)correspond to levels of activity
OK，这道题目出的太绕。单纯从阅读文章意思的角度讲，很难知道作者想IMPLICIT什么。但是如果想到是考察文章结构和对文章主要意思把握能力，这个题目，从“考试”角度讲，就象你的处理过程一样，B，C马上就可以排除。A和D需要选择。文章论证部分全部都在说ACTIVITIES OF DIFFERENT SPECIES OF ANIMALS， 但是，没有一句话把这些ACTIVITIES和大脑的重量联系起来的。所以，D好像不是一个很合理的INFERRENCE。
不妨在这里停一下，看看A。文章里有一句话No one has yet explained how bees, whose brains weigh four ten-thousandths of an ounce, could have inferred the location of the new site.，大概意思是：“然而，没有人能够解释（这个能力：）蜜蜂能够推断新的（食物）地点，尽管蜜蜂的大脑重量只有千分之四盎司。 在这里，我们可以想一下，为什么作者要说这句话？它的ASSUMPTION是什么？为什么要重新看这句话？很简单的原因，这句话和文章其他部分脱节。它之所以突然出现，应该是想INTRODUCE SOME NEW INFO。按照一些托福班的经典课堂授课模式，老师会说：“想到这里，我们就会眼前一亮：哦，原来如此！”这个时候RULE OUT D AND TAKE A AS CORRECT ANSWER WILL SOMETHING NATURAL。
其实呢，如果是考试，我也不会想的这么复杂。很可能我凭感觉会直接把B，C，D都划掉的，然后给A找理由。if there is no obvious oppostite details in the passage, i will go on to the next question.
二，任何问题讨论都需要一个大框框：所有讨论必须建立在这个框框里，不可以出的。否则，肯定是错的。请看开头第一句话：Scientists have discovered that for the last 160,000 years, at least, there has been a consistent relationship between the amount of carbon dioxide in the air and the average temperature of the planet.--这个就是这篇阅读的框框。科学家们所有的结论只是对160，000年内有效。在这个框框外的咚咚都和题目没有关系。如果阅读不看第一句，对问题就很难理解对了。其实，老师们天天告诫要仔细看首句，是有道理的，因为T的文章都是SORT OF 八股文：观点明确，结构清晰。
四，TAISHA对句子翻译重心不太准确。Through the 160,000 years of that ice record, the level of carbon dioxide in the atmosphere fluctuated between 190 and 280 parts per million, but never rose much higher-until the Industrial Revolution beginning in the eighteenth century and continuing today.大概意思是“根据（已经钻出来的，呵呵）大冰坨子（分析），在过去的160K年里，大气中的CO2浓度一直在190到280PPM之间徘徊， 但是从来没有升高到象（从18世纪一直持续到今天的）工业革命时期那么高的浓度”。
五，D之所以不好，主要是出了框框，BESIDES， 文章在结尾的陈述是用了INDIRECT和MAY HAVE BEEN。这些委婉而且不确定的语气在TOEFL中很少用来陈述主要意思的。
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发表于 2007-10-9 22:34:00
