In response to mounting public 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?
A. The amount of nonhazardous waste generated each year by the passenger-jet division has not increased significantly since 1994.
B. At least as many passenger jets were produced by the division last year as had been produced in 1994.
C. Since 1994, other divisions in the company have achieved reductions in hazardous waste output that are at least equal to that achieved in the passenger-jet division.
D. The average number of weekly hours per production worker in the passenger-jet division was not significantly greater last year than it was 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.
想知道D选项为什么不行？ 谢谢 作者: cxfighting 时间: 2012-5-4 11:28
题目中强调这个programde 的作用是减少total amount of waste。虽然就per production worker 而言，waste output的百分比下降了，但是如果本来worker数量在94年少而在去年很多，就不能说明total amount下降了，所以加上E选项是必要的。作者: linshenzi 时间: 2012-5-7 11:01
工作时间跟这道题没有关系吧。。我觉得~作者: 7890613 时间: 2012-10-8 00:18
90 pounds per production worker 你不知道这里的人均是每小时呢？还是每年呢？作者: shek1985 时间: 2012-10-8 00:35
同意3楼，和工作时间没关系。