LSAT考试逻辑推理练习题（38）

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77.Allintelligent people are nearsighted. I am very nearsighted. So I must be agenius.

Which one of the following exhibits both of thelogical flaws exhibited in the argument above?

(A) I must be stupid because all intelligent peopleare nearsighted and I have perfect eyesight.

(B) All chickens have beaks. This bird has a beak.So this bird must be a chicken.

(C) All pigs have four legs, but this spider haseight legs. So this spider must be twice as big as any pig.

(D) John is extremely happy, so he must beextremely tall because all tall people are happy.

(E) All geniuses are very nearsighted. I must bevery nearsighted since I am a genius.

78.In opposing the 1970 Clean Air Act, the United States automobile industry argued

that meeting the act’s standards for automobile emissions was neither economically feasible nor

environmentally necessary. However, the catalytic converter, invented in 1967, enabled automakers to meet the 1970 standards efficiently. Currently, automaker are lobbying against the government’s attempt to pass legislation that would tighten restrictions on automobile emissions. The automakers contend that these new restrictions would be overly expensive and unnecessary to efforts to curb air pollution. Clearly, the automobile industry’sposition should not be heeded.

Which one of the following most accurately expresses the method used to counter the automakers’currentposition?

(A) The automakers’premises areshown to lead to a contradiction.

(B) Facts are mentioned that show that theautomakers are relying on false information.

(C) A flaw is pointed out in the reasoning used bythe automakers to reach their conclusion.

(D) A comparison is drawn between the automakers’currentposition and a position they held in the past.

(E) Evidence is provided that the new emissionslegislation is both economically feasible and environmentally necessary.

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