GWD3-28

Q28:

Certain politicians in the country of Birangi argue that a 50 percent tax on new automobiles would halt the rapid increase of automobiles on Birangi’s roads and thereby slow the deterioration of Birangi’s air quality.  Although most experts agree that such a tax would result in fewer Birangians buying new vehicles and gradually reduce the number of automobiles on Birangi’s roads, they contend that it would have little impact on Birangi’s air-quality problem.

Which of the following, if true in Birangi, would most strongly support the experts’ contention about the effect of the proposed automobile tax on Birangi’s air-quality problem?

1. Automobile emissions are the largest single source of air pollution.

2. Some of the proceeds from the new tax would go toward expanding the nonpolluting commuter rail system.

3. Currently, the sales tax on new tax on new automobiles is considerably lower than 50 percent.

4. Automobiles become less fuel efficient and therefore contribute more to air pollution as they age.
5. The scrapping of automobiles causes insignificant amounts of air pollution.

答案选D，为什么不是E呢？I think since the scrapping of automobiles causes insignificant amounts of air pollution, so even if the strategy reduces the number of automobiles on the roads, it would have little impact on Birangi’s air-quality problem.

而D，就算Automobiles become less fuel efficient and therefore contribute more to air pollution as they age. But after the reduction the number of automobiles on Birangi’s roads, which is agreed by the experts, 数量 x 排放量 + ??是未知的呀。请指教！

同学你想的也太复杂了吧～～～我没有细看你的答案但是一看你那个数学公示就知道你想错了。

注意一句话: a tax would result in fewer Birangians buying new vehicles
            

D 恰好是支持，因为污染的主要原因是 随着车的年龄的增加（注意as they age.），燃料燃烧没有效率。

而新法律是作用于new cars，所以it would have little impact on Birangi’s air-quality problem.

E irrelevance。原文没有说scarpping怎么样怎么样的，你想那么多干什么？

对的。

E)中the scrapping of automobiles causes insignificant amounts of air pollution, 说的是车的报废产生污染很少，也只能说明保持现有车辆对空气污染无足轻重。但是也并不能由此得出征新车的税对空气质量改善影响是大是小。E是无关选项。

很赞同，谢谢