各位大侠请进来讨论一下：prep SC1 13、24、37题

sunny803 · 发表于 2009-12-23 20:58:10

13. Which of the following most logically completes the argument?

United States manufacturers currently produce most of the world's solar-power generators--most of which are exported to Europe. However, European manufacturers are emerging and probably will ultimately capture much of the European market. The United States government is funding initiatives intended to encourage use of solar power within the United States. If these initiatives succeed in increasing the demand for solar-power generators in the United States, United States manufacturers will probably maintain significant production levels, since __________.
(A) some United States manufacturers have been substantially increasing their output over the last several years
(B) the efficiency of solar-power generators in converting energy from the Sun into electric power is not improving as fast as it once did
(C) just as European manufacturers enjoy certain competitive advantages in Europe, so do United States manufacturers in the United States
(D) European governments are currently undertaking initiatives to stimulate the use of solar power within Europe
(E) the current market for solar-power generators in the United States is very limited
这道题目我在C和E中犹豫了一下，最后选了E，答案是C。
我的思路是这样：题目的推理是采取措施成功提升美国国内对太阳能发电器的需求——美国能保持较大的太阳能发电器产量，也就是说，美国国内需求的提升，能弥补欧洲市场中由于欧洲本土竞争对手的崛起而导致的对美国太阳能发电机的需求下降。E 选项说美国目前的太阳能发电机的市场非常有限，也就是说美国的市场需求还有很大待激发的空间，激发了这些需求，就能很大程度弥补其在欧洲市场上面临的需求下降。所以我选了E。选项C说美国厂商在美国本土有很大的竞争优势，我想如果这个能让美国保持原有的产量，也必须是建立在国内需求可大幅提升的基础之上，所以想想就放弃掉了。请各位大侠帮忙解释一下。

24.Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack.

erhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop.
(A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately turns and runs away without its usual intermittent stopping.
(B) In pursuing a moving insect, the beetles usually respond immediately to changes in the insect's direction, and pause equally frequently whether the chase is up or down an incline.
(C) The beetles maintain a fixed time interval between pauses, although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause.
(D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
(E) When an obstacle is suddenly introduced just in front of running beetles, the beetles sometimes stop immediately, but they never respond by running around the barrier.
这个题目是所有选项我看来看去都觉得不对，晕了

37.Capuchin monkeys in Venezuela often rub a certain type of millipede into their fur. Secretions of these millipedes have been shown to contain two chemicals that are potent mosquito repellents, and mosquitoes carry parasites that debilitate the capuchins. The rubbing behavior is rare except during the rainy season, when mosquito populations are at their peak. Therefore, the monkeys probably rub the millipedes into their fur because doing so helps protect them against mosquitoes.
(A) Whether the two chemicals provide any protection for the millipedes against their own predators
(B) Whether the type of millipede used by the capuchin monkeys in Venezuela is found in other parts of the world
(C) Whether animals other than capuchins rub insects of any kind into their fur
(D) Whether the only time the millipedes are readily available to the capuchins is during the rainy season
(E) Whether secretions of any other insects accessible to the capuchins contain chemicals that repel mosquitoes
答案是D。但是我也很是疑惑。题目的推理是，1）卷尾猴几乎只在雨季抓M虫 2）M虫的分泌物有防蚊成分 3）雨季蚊子最多——卷尾猴抓M虫是为了防蚊。如果肯定选项D，M虫只能在雨季抓到，貌似也不能使结论成立；如果否定选项D，M虫不只可以在雨季抓到，也不能使结论不成立。百思不得其解

请各位大侠指点迷津啊，谢谢

boboinsz · 发表于 2009-12-24 00:10:21

OG12上也有这题，但是好像有点变体，选项的wording有点不同。我把OG上的解释搬过来了。看看能帮到你不？

25. Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, a tiger beetle will intermittently stop and then, a moment later, resume its attack. Perhaps the beetles cannot
maintain their pace and must pause for a moment’s rest; but an alternative hypothesis is that while running, tiger beetles
are unable to adequately process the resulting rapidly changing visual information and so quickly go blind and stop.
Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two
hypotheses and undermine the other?

(A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately stops and runs
away without its usual intermittent stopping.
(B) In pursuing a swerving insect, a beetle alters its course while running and its pauses become more frequent as the
chase progresses.
(C) In pursuing a moving insect, a beetle usually responds immediately to changes in the insect’s direction, and it pauses
equally frequently whether the chase is up or down an incline.
(D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit.
(E) The faster a beetle pursues an insect fleeing directly away from it, the more frequently the beetle stops.

Argument Evaluation
Situation Two hypotheses are off ered to explain the sudden stop that tiger beetles make while pursuing
their prey: (1) they cannot maintain the rapid pace and must rest, and (2) they run too quickly to
process visual information and so temporarily go blind.
Reasoning

What point would strengthen one of the two hypotheses and weaken the other? Consider the
information provided in each answer choice, remembering that information that supports one
hypothesis must necessarily detract from the other. Any information that is not about pursuit or
that aff ects the two hypotheses equally may be dismissed from consideration. If the frequency of
stopping increases when the beetle follows a swerving insect and must constantly change its
course, then the second hypothesis is strengthened; the beetle’s pauses increase as the variety of
visual information that it needs to deal with increases.
A Th e hypotheses concern ongoing pursuit; since this information is not about the beetle’s continuing pursuit
of prey, it neither strengthens nor weakens either hypothesis.
B Correct. Th is statement provides information that strengthens the second hypothesis: the swerving pursuit
and the resulting continual course adjustments appear to be forcing the beetle to stop with increasing
frequency to sort out the erratic visual information.
C In this experiment, since neither vision nor tiredness appears to be problematic, the beetle could be
stopping for either reason; this information neither strengthens nor weakens either hypothesis.
D Th is information is irrelevant since both the hypotheses are about mid-pursuit behaviors.
E Th e correlation of frequency of stops with speed aff ects both hypotheses equally; the pauses could be
equally due to an inability to maintain the pace or due to a need to process the visual information.
Th e correct answer is B.

各位大侠请进来讨论一下：prep SC1 13、24、37题

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