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8. Measurements of the extent of amino-acid decomposition in fragments of eggshell found at archaeological sites in such places as southern Africa can be used to obtain accurate dates for sites up to 200,000 years old. Because the decomposition is slower in cool climates, the technique can be used to obtain accurate dates for sites almost a million years old in cooler regions.
The information above provides the most support for which one of the following conclusions?
(A) The oldest archaeological sites are not in southern Africa, but rather in cooler regions of the world.
(B) The amino-acid decomposition that enables eggshells to be used in dating does not take place in other organic matter found at ancient archaeological sites.
(C) If the site being dated had been subject to large unsuspected climatic fluctuations during the time the eggshell has been at the site, application of the technique is less likely to yield accurate results.
(D) After 200,000 ears in a cool climate, less than one-fifth of the amino acids in a fragment of eggshell that would provide material for dating with the technique will have decomposed and will thus no longer be suitable for examination by the technique.
(E) Fragments of eggshell are more likely to be found at ancient archaeological sites in warm regions of the world than at such sites in cooler regions.
我看到有大虾说过，做题目的时候要把自己当作idiot，我不觉得这里隐含了气候比较稳定的说法啊，原文倒是提到the decomposition is slower in cool climates, . 所以我觉得E对
20. Normal full-term babies are all born with certain instinctive reflexes that disappear by the age of two months. Because this three-month-old baby exhibits these reflexes, this baby is not a normal full-term baby.
Which one of the following has a logical structure most like that of the argument above?
(A) Because carbon dioxide turns limewater milky and this gas is oxygen, it will not turn limewater milky.
(B) Because no ape can talk and Suzy is an ape, Suzy cannot talk.
(C) Because humans are social animals and Henry is sociable, Henry is normal.
(D) Because opossums have abdominal pouches and this animal lacks any such pouch, this animal is not an opossum.
(E) Because some types of trees shed their leaves annually and this tree has not shed its leaves, it is not normal. 这题B为啥不对？它的LOGIC STRUCTURE 不怎么清楚
In opposing the 1970 Clean Air Act, the United States automobile industry argued that meeting the act’s standards for automobile emissions was neither economically feasible nor environmentally necessary. However, the catalytic converter, invented in 1967, enabled automakers to meet the 1970 standards efficiently. Currently, automaker are lobbying against the government’s attempt to pass legislation that would tighten restrictions on automobile emissions. The automakers contend that these new restrictions would be overly expensive and unnecessary to efforts to curb air pollution. Clearly, the automobile industry’s position should not be heeded.
24. Which one of the following most accurately expresses the method used to counter the automakers’ current position?
(A) The automakers’ premises are shown to lead to a contradiction.
(B) Facts are mentioned that show that the automakers are relying on false information.
(C) A flaw is pointed out in the reasoning used by the automakers to reach their conclusion.
(D) A comparison is drawn between the automakers’ current position and a position they held in the past.
(E) Evidence is provided that the new emissions legislation is both economically feasible and environmentally necessary. 这题以前的解释我觉得没解释清楚，我也觉得E对，哪位高手能再解释一下，谢谢  | 
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发表于 2005-1-29 20:05:00
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