大全-13-2

    Woodsmoke contains dangerous toxins that cause changes in human cells. Because woodsmoke presents such a high health risk, legislation is needed to regulate the use of open-air fires and wood-burning stoves.

Which of the following, if true, provides the most support for the argument above?

(A) The amount of dangerous toxins contained in woodsmoke is much less than the amount contained in an equal volume of automobile exhaust.

(B) Within the jurisdiction covered by the proposed legislation, most heating and cooking is done with oil or natural gas.

(C) Smoke produced by coal-burning stoves is significantly more toxic than smoke from wood-burning stoves.

(D) No significant beneficial effect on air quality would result if open-air fires were banned within the jurisdiction covered by the proposed legislation.（E）

(E) In valleys where wood is used as the primary heating fuel, the concentration of smoke results in poor air quality.

Why D is not correct? 是因为air quality 不等于smoke 吗？

The matter here is not whether air quality equals smoke.

Here we want to support the argument, that is we should show that open fire do cause harm to human health. As E stated.

In D, we know that this law is useless, then the argument is weakened.