求教陈向东逻辑题

wym62595698 · 发表于 2011-10-25 14:44:29

In 1985 a consumer agency concluded that Xylo brand bicycles are safer to ride than are Zenon brand bicycles. The agency based the conclusion on the ratio of the number of bicycle form 1981 through 1984. Yet for identically designed bicycles manufactured since 1985, the number of rider injuries has been twice as great among riders of Xylos as among riders of Zenons. Therefore, the agencey's conclusion would have been different for the period since 1985.
Which of the following is an assumption that, if true, supports the claim that the agency's conclusion would have been different for the period since 1985?
(A) For the period since 1985, the number of riding hours for Zenons totaled at least half the number of riding hours for Xylos.
(B) Of all the bicycles ridden in the period since 1985, the percentage of Xylos ridden was twice the percentage of Zenons ridden.
(C)

rior to 1985 ,Zenon owners were more likely than Xylo owners to report the injuries the sustained while riding their bicycles.
(D) In 1985 the agency had miscalculated the ration for Xylos, for Zenons, or for both
(E) Soon after the agency had issued its report, consumer demand for Xylos increased more rapidly than did consumer demand for Zenons.
答案 A
我怎么想怎么A 不对啊。。。如果说骑Zenon 牌子的自行车小时总数是骑Xylo牌子的一半。那么很理所当然的X 的事故率高了啊。。。怎么支持结论了？？？
希望NN 们指点。。。

求教陈向东逻辑题

所属分类: GMAT考试

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