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Bunuel
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A. The argument needs the cold to actually interact with the toxin and increase the chance of illness. Otherwise, the higher sickness rate can't really be attributed to the cold. Looks correct
B. If the toxins had different strengths, that would actually undermine the experiment. The difference in sickness could simply be due to the toxin.
C. Whether the toxin itself causes illness isn't the key issue. The argument is about whether cold increases the likelihood of illness.
D. This would actually make the conclusion harder to support. If the first group would have gotten sick anyway, cold may have had nothing to do with it.
E. The experiment isn't about small temperature variations; it's specifically comparing cold vs. normal temperature.
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IMO, A. As this directly corelates that cold temperature is the differential between the two cages which results in greater proportion of sick rats in first cage.
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Bunuel
­Two different cages of rabbits were given injections of mild toxins. In addition, the first cage was also exposed to cold temperature; three-fourths of the rabbits in this cage became sick. Only one-fifth of the rabbits in the normal temperature cage became sick. The lab technicians concluded that cold temperature increases the likelihood of illness in rabbits.

The technicians' conclusion logically depends on which of the following assumptions?

(A) The exposure to cold temperature acted as a catalyst for the toxins which made more rabbits in the first cage sick.

(B) The toxins given to the rabbits in the two cages were of varying strength.

(C) Injecting the rabbits with toxins made them sick.

(D) Even without the exposure to cold temperature, the rabbits in the first cage would have probably gotten sick.

(E) Even exposing rabbits to slight variances in temperature is likely to induce illness.


­
The OA is A.

OFFICIAL EXPLANATION:



If more rabbits became sick in the cage where they were exposed to colder temperature, as opposed to the warmer cage where fewer rabbits became sick, after being injected with the same toxins, it can be assumed that the combination of cold temperature and the toxin makes more rabbits sick. Choice A is the best answer. All other choices can be true on a stand-alone basis. However, they do not support the technicians' conclusion.­
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