T-3-Q16.
In response to mounting public concern, an airplane manufacturers implement a program with 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 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 1984

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.

答案是B, 但D错那里了呢，per production worker 是什么意思呢

请指教！

AB模式..明显的要使条件A有意义.

选B.取非削弱.

D无关吧...

目标是使总污染减一半，实施后只说每位工人产生的污染减到了40%，B说：去年飞机产量>=94年飞机产量，那总的污染有可能并没有减少啊。

不懂

这道题肯定选E吧，求total的，知道效率了那肯定要确定工人个数啊

这个我都没看其他选项就直接推出来了。

B也表明了一个total的概念，但是中间有个Gap，就是飞机数量一样了，还得hazardous waste一样才行，而E，X tons per production worker* no. of worker=total hazardous waste。更直接.

这题选E啊

说去年的员工数量没有比1994年员工数少。

文中的目标是half the total yearly amount of hazardous waste generated by its passenger-jet division.

但是通过的是人均来说明。

前提就是总人数没有变。

因为total=人均*人数

明白了吗？