23. On a certain day, nine scheduled flights on Swift Airlines were canceled. Ordinarily, a cancellation is due to mechanical problems with the airplane scheduled for a certain flight. However, since it is unlikely that Swift would have the mechanical problems with more than one or two scheduled flights on a single day, some of the nine cancellations were probably due to something else.

　　(A) More than one or two airplanes were scheduled for the nine canceled flights.

　　(B) Swift Airlines has fewer mechanical problems than do other airlines of the same size.

　　(C) Each of the canceled flights would have been longer than the average flight on Swift Airlines.

　　(D) Swift Airlines had never before canceled more than one or two scheduled flights on a single day.

　　(E) All of the airplanes scheduled for the canceled flights are based at the same airport.

　　24. The interstitial nucleus, a subregion of the brain's hypothalamus, is typically smaller for male cats than for female cats. A neurobiologist perFORMed autopsies on male cats who died from disease X, a disease affecting no more than .05 percent of male cats, and found that these male cats had interstitial nuclei that were as large as those generally found in female cats. Thus, the size of the interstitial nucleus determines whether or not male cats can contract disease X.

　　Which one of the following statements, if true, most seriously weakens the argument?

　　(A) No female cats have been known to contract disease X, which is a subtype of disease Y.

　　(B) Many male cats who contract disease X also contract disease Z, the cause of which is unknown.

　　(C) the interstitial nuclei of female cats who contact disease X are larger than those of female cats who do not contract disease X.

　　(D) Of 1,000 autopsies on male cats who did not contract disease X, 5 revealed interstitial nuclei larger than those of the average male cat.

　　(E) The hypothalamus is known not to be causally linked to disease Y, and disease X is a subtype of disease Y.

　　25. There should be a greater use of gasohol. Gasohol is a mixture of alcohol and gasoline, and has a higher octane rating and fewer carbon monoxide emissions than straight gasoline. Burning gasohol adds no more carbon dioxide to the atmosphere than plants remove by photosynthesis.

　　Each of the following, if true, strengthens the argument above EXCEPT:

　　(A) Cars run less well on gasoline than they do on gasohol.

　　(B) Since less gasoline is needed with the use of gasohol, an energy shortage is less likely.

　　(C) Cars burn on the average slightly more gasohol per kilometer than they do gasoline.

　　(D) Gasohol is cheaper to produce and hence costs less at the pump than gasoline.

　　(E) Burning gasoline adds more carbon dioxide to the atmosphere than plants can remove

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