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1.   remise: 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. Conclusion: Carl is clearly an incompetent detective. Q: weaken Inference: an incompetent detective≠ a smaller percentage of the cases A: the most capable detective= the most difficult cases= a smaller percentage of the cases B: There is no relationship with the condition about that he became the detective. C: It strengthens the argument, instead of weakening. D: Although we can see that Carl made progress during the 7 years, the answer provides no evidence to prove that he is not an incompetent detective. E: Nothing provided can prove Carl is not an incompetent detective.
2. Background: F can be found both in the laboratory and in fissures of the rare mineral shungite. Premise: laboratory synthesis of F requires distinctive conditions of temperature and pressure. Conclusion: the discovery helps geologists evaluate hypotheses about the state of crust at the time these naturally occurring F were formed. Q: weaken Inference: distinctive conditions of temperature and pressure in laboratory can not reveal the state of crust
3. Background: On average, the emergency treatment for an elderly person for injuries resulting from a fall costs $11,000. Premise: A new therapeutic program can reduce an elderly person’s chances of falling. Conclusion: this treatment program will cost $12,500 and thus cannot be justified. Q: weaken Inference: even though $12,500 is greater than $11,000, the program is still justified.
4. The seasonal variation, variation that most voles live in far smaller groups from spring through early autumn, can probably be explained by a seasonal variation in mortality among young voles. A: The seasonal variation influence snakes, a major predator of young voles. Thus, the fact results the variation of the population of voles.
5. Because the dolphins that benefit from the program as adults spend much less time teaching their offspring to survive in the wild than do other adult dolphins, the young have a lower life expectancy than those of dolphins that feed exclusively in the wild. |
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