In response to mounting pubic concern, an airplane manufacturer implemented a program with the well-publicized goal of reducing by half the total yearly amount of hazardous waste generated by its passenger-jet division. When the program began in 1994, the division’s hazardous waste output was 90 pounds per production worker; last year it was 40 pounds per production worker. Clearly, therefore, charges that the manufacturer’s program has not met its goal are false.
Which of the following is an assumption on which the argument depends?
B. At least as many passenger jets were produced by the division last year as had been produced in 1994.
E. The number of production workers assigned to the passenger-jet division was not significantly less in 1994 than it was last year.
文章说制造商的目标是:减少总排污量的一半。
衡量指标是:**磅/制造工人
总排污量=衡量指标×工人总数
94年这个指标的值是90,现在是40,明显减少了一半多,结论是目标达到了,但是忽略了一个假设,如果现在的工人总数大大多于94年,计算出来的总排污量并不会比94年减少一半(数学问题),说不一定还多,这不就证明目标没有达到么,削弱了结论。把E取非就是这个意思。
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