求教逻辑大全——TestD-第12题

adasuying2004

Since the passage of the state’s Clean Air Act ten years ago, the level of industrial pollutants in the air has fallen by an average of 18 percent. This suggests that the restrictions on industry embodied in the act have worked effectively. However, during the same period the state has also suffered through a period of economic decline. The number of businesses in the state has fallen by 10 percent, and the number of workers employed has fallen by 12 percent. It is probable that the business decline, rather than the regulations in the act, is responsible for at least half of the decline in the pollution.
大全-D-12.    Which of following is an assumption made in the passage above?
(A) Most businesses in the state have obeyed the regulations embodied in the Clean Air Act.
(B) The economic decline of the state can be attributed, in part, to the effects of the Clean Air Act.
(C) The amount of air pollution in a given area is likely to be proportional to the number of businesses and workers active in that area.
(D) The restrictions on business activity in other states are less stringent than are those embodied in the Clean Air Act.
(E) The Clean Air Act has been only very slightly successful in achieving the goal of reduced air pollution.
答案是C，为啥我觉得E靠谱？

loverwy

原文结论：有可能企业数量的下降使得工业排污量减少至少9%（at least half of the decline in the population: 18%）

E： 只能说明法案贡献很小，但无法进一步说明为什么企业数量的下降会带动工业排污量下降至少9%

而C比较完美，因为企业数量下降了10%，如果企业下降数量和工业排污减少量成正比，那工业排污量也会减少10%,  正好呼应原文