GWD Astronomer:Observations of the Shoemaker-Levi comet on its collision course with Jupiter showed that the comet broke into fragments before entering Jupiter’s atmosphere in 1994, but they did not show how big those fragments were.Nevertheless, some indication of their size can be inferred from spectrographic analyses of Jupiter’s outer atmosphere.After the fragments’ entry, these analyses revealed unprecedented traces of sulfur.The fragments themselves almost certainly contained no sulfur, but astronomers believe that the cloud layer below Jupiter’s outer atmosphere does contain sulfur.Since sulfur would have seeped into the outer atmosphere if comet fragments had penetrated this cloud layer, it is likely that some of the fragments were at least large enough to have passed through Jupiter’s outer atmosphere without being burned up.
In the astronomer’s argument, the two portions in boldface play which of the following roles?
A.The first is a claim that the astronomer seeks to show is true; the second acknowledges a consideration that weighs against the truth of that claim.
B.The first is a claim that the astronomer seeks to show is true; the second provides evidence in support of the truth of that claim.
C.The first and the second are each considerations advanced in support of the conclusion of the argument.
D.The first provides evidence in support of the conclusion of the argument; the second is that conclusion.
E.The first is a circumstance for which the astronomer seeks to provide an explanation; the second acknowledges a consideration that weighs against the explanation provided by the astronomer.
CR 说deer tick会带一种bacteria，这种bacteria会导致某种疾病，然后发现这种bacteria是因为deer吃了某white mice，mice带了这种病菌。然后说试验发现，deer的其他食物都没有带这种病菌，所以如果其他食物的量Increase的话，deer带这种病菌的就会少，人们患某种疾病的几率也会降低，问support c. 人们不会通过和Mice的接触得那种疾病 d.deer在某某阶段只进食一次（大概就是它需要吃东西的时候） ······················································································· V2说的是GWD原题 T-9-Q28.天山-7-13 Lyme disease is caused by a bacterium transmitted to humans by deer ticks. Generally deer ticks pick up the bacterium while in the larval stage from feeding on infected white-footed mice. However, certain other species on which the larvae feed do not harbor the bacterium. Therefore, if the population of these other species were increased, the number of ticks acquiring the bacterium and hence the number of people contracting Lyme disease would likely decline.
Which of the following, if true, most strengthens the argument?
A.Ticks do not suffer any adverse consequences from carrying the bacterium that causes Lyme disease in humans.
B.There areno known casesof a human’s contracting Lyme disease through contact with white-footed mice.
C.A deer tick feeds only once while in the larval stage.
D.A single host animal can be thesource of bacterium for many tick larvae.
E.None of the other species on which deer tick larvae feed harbor other bacteriathat ticks transmit to humans
Lyme disease is caused by a bacterium transmitted to humans by deer ticks.Generally, deer ticks pick up the bacterium while in the larval stage by feeding on infected white-footed mice.However, certain other species on which the larvae feed do not harbor the bacterium.If the population of these other species were increased, more of the larvae would be feeding on uninfected hosts, so the number of ticks acquiring the bacterium would likely decline.
Which of the following would it be most important to ascertain in evaluating the argument?
A. Whether populations of the other species on which deer tick larvae feed are found only in areas also inhabited by white-footed mice
B. Whether the size of the deer tick population is currently limited by the availability of animals for the tick's larval stage to feed on
C. Whether the infected deer tick population could be controlled by increasing the number of animals that prey on white-footed mice
D. Whether deer ticks that were not infected as larvae can become infected as adults by feeding on deer on which infected deer ticks have fed
E. Whether the other species on which deer tick larvae feed harbor any other bacteria that ticks transmit to humans
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发表于 2010-6-16 12:01:32
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