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- 2014-9-29
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1.
Conclusion: Carl is clearly an incompetent detective. Premise: He has solved a smaller percentage of the cases assigned to him in the last 3 years—only 1 out of 25—than any other detective on the police force.
Weaken: Which one of the following, if true, most seriously weakens the argument above?
Prephrase: Carl is not incompetent. Conditions could be the cases he did were the toughest, time-costing and energy-costing. so, should be (A).
2.
Background: Although fullerenes--spherical molecules made entirely of carbon--were first found in the laboratory, they have since been found in nature, formed in fissures of the rare mineral shungite. Premise: Since laboratory synthesis of fullerenes requires distinctive conditions of temperature and pressure, Conclusion: this discovery should give geologists a test case for evaluating hypotheses about the state of the Earth's crust at the time these natural
Weaken:Which of the following, if true, most seriously undermines the argument?
Prephrase: this discovery can’t give a test case for evaluating. Condition could be the lab cannot synthesis fullerenes repeatedly or the condition of temperature and pressure doesn’t represent the Earth’s natural. So, should be (D).
3.
Economist: Premise1:On average, the emergency treatment for an elderly person for injuries resulting from a fall costs $11,000. Premise2: A new therapeutic program can significantly reduce an elderly person's chances of falling. Conclusion: Though obviously desirable for many reasons, this treatment program will cost $12,500 and thus cannot be justified.
Weaken: Which of the following, if true, most seriously undermines the conclusion of the argument?
Prephrase: new treatment will not cost such amount. Condition could be more payment for other conditions, like consulting fee. So, should be (E).
4.
Background: The prairie vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters. Premise: Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups. Conclusion: The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.
Strengthen: Which of the following, if true, provides the strongest support for the explanation offered?
--PREP07 CR1 NO.3
Prephrase: from spring through early autumn, small group because high mortality; from late autumn through winter, large group because low mortality
Condition could be like (E).
5.
Background: A popular beach has long had a dolphin feeding program in which fish are given to dolphins several times a day; many dolphins get as much as half of their food each day there. Premise: Although dolphins that first benefit from the program as adults are healthy and long-lived, Conclusion: their offspring have a lower life expectancy than offspring of dolphins that feed exclusively in the wild.
Strengthen: Which of the following, if true, most helps to explain the lower life expectancy of offspring of dolphins feeding at the beach compared to other young dolphins?
--PREP07 CR1 NO.4
Prephrase: offspring cannot survive longer
Condition could be parents effects, lack of sports, surviving ability decrease, weak physique
So, should be (E).
Q3 is wrong. Let me try to understand why~~ |
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