T-3-Q16.和T-4-Q2 ,请教啊!!

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?

1. the amount of nonhazardous waste generated each year by the passenger-jet division has not increased significantly since 1984

2. at least as many passenger jets were produced by the division last year as had been produced in 1994

3. 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.

4. 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.

5. The number of production workers assigned to the passenger-jet division was not significantly less in 1994 than it was last year.

Which of the following, if true, most helps to account for the drop in reclamation costs described?

1. Even after Balzania began requiring surface mine operators to pay reclamation costs, coal mines in Balzania continued to be less expensive to operate than coal mines in almost any other country.

2. In the twenty years since the regulations took effect, the use of coal as a fuel has declined from the level it was at in the previous twenty years.

3. Mine operators have generally ceased surface mining in the mountainous areas of Balzania because reclamation costs per ton of coal produced are particularly high for mines in such areas.

4. Even after Balzania began requiring surface mine operators to pay reclamation costs, surface mines continued to produce coal at a lower total cost than underground mines.

5. As compared to twenty years ago, a greater percentage of the coal mined in Balzania today comes from surface mines.

第一道题应该比较清晰：90降至40 per worker，原因可能有两个。一个是总的排量的确是减少了，另一个就是工人数量增多。所以答案直接找工人增多，即E，应该没有悬念。

第二道题题情况相似：平均征地开矿价格下降可能是1）技术提高效率，或是 2）征地开矿时耗费的总代价降低。题中已经说明技术没有变，那只能是征地开矿总耗费降低。直接在答案中找，发现在山区征用要比平地要贵，那么如果减少或放弃征用山地，那征地开矿总费用自然就降下来了。这样以征用平地为主的开矿方式，自然使征地开矿的均价降了下来。

所以我认为答案是C。

请大家指正。

agree