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LSAT - Set 11 - I - 16, 24
A favored theory to explain the dinosaurs, together with many other species, has been the globally catastrophic collision of a large asteroid with the Earth: Supporting evidence is an extraterrestrial chemical element in a layer of dust found worldwide at a geological level laid down contemporaneously with the supported event. A new competing theory contends that any asteroid impact was irrelevant, because it was massive volcanic activity that caused the extinctions by putting enough dust into the atmosphere to cool the planet. The Decean region of India contains extensive volcanic flows that occurred within the same time period as the supposed asteroid impact and the extinctions.
16. Which one of the following, if true, most of strongly indicates that the asteroid-impact theory is at least incomplete, if not false?
(A) Large concentrations of dinosaur nests with fossil eggs found in Alberta indicate that at least some species of dinosaurs congregated in large groups during some part of their lives.
(B) Dinosaur remains indicate that some species of dinosaur could have migrated in herds over wide ranges, so that they could have traveled to escape the local effects of certain catastrophes.
(C) Legends from many cultures, such as the Creex legend that Cudmus raised an army by sowing dragons’ teeth in the ground, show that various accident peoples worldwide were familiar with the fossils of dinosaurs.
(D) In the Gobi desert in China, where now only small animals can eke out an existence, fossil dinosaur skeletons 27 feet long were found in circumstances indicating that the climate there was as dry when the dinosaurs lived as it is now.
(E) The fossil record in Montano from below the layer of extraterrestrial dust shows a diminution over time in dinosaur species from 35 to 13, and dinosaur teeth found above the dust layer show a diminution in species from 13 to 5.
答案：E
这道题曾经讨论过E选项。我想请教B的逻辑错误。
原文：asteroid-impact theory 声称恐龙的灭绝是行星撞地球引起的环球大灾难(the globally catastrophic collision)。
B选项说明幸免的恐龙是因为迁移而逃离了地域性的灾难。这不也证明了asteroid-impact theory 是不正确或不完整的，因为如果有环球性的灾难，迁移是救不了恐龙的。
24. The body of anyone infected by virus X will, after a week, produce antibodies to fight the virus: the antibodies will increase in number for the next year or so. There is now a test that reliably indicates now many antibodies are present in a person’s body. If positive, this test can be used during the first year of infection to estimate to within a month how long that person has had the virus.
Which one of the following conclusions is best supported by the statements above?
(A) Antibodies increase in number only until they have defeated the virus.
(B) Without the test for antibodies, there is no way of establishing whether a person has virus X.
(C) Antibodies are produced only for viral infections that cannot be fought by any other body defenses.
(D) If a person remains infected by virus X indefinitely, there is no limit to the number of antibodies that can be present in the person’s body.
(E) Anyone infected by virus X will not a time fail to exhibit infection if tested by the antibody test
答案 E，我选 B，为什么呢？
其它：听说 "parallel" 的题目GMAT 不会考，那象 ‘employs which one of the following reasoning techniques? ’ 的找逻辑思路的题呢？
谢谢！！
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发表于 2003-7-14 14:29:00
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