in old prep help

狂威雪

11.(24915-!-item-!-188;#058&001837)

Radio stations with radio data system (RDS) technology broadcast special program information that only radios with an RDS feature can receive.Between 1994 and 1996, the number of RDS radio stations in Verdland increased from 250 to 600.However, since the number of RDS-equipped radios in Verdland was about the same in 1996 as in 1994, the number of Verdlanders receiving the special program information probably did not increase significantly.

Which of the following is an assumption on which the argument depends?

(A) Few if any of the RDS radio stations that began broadcasting in Verdland after 1994 broadcast to people with RDS-equipped radios living in areas not previously reached by RDS stations.

(B) In 1996 most Verdlanders who lived within the listening area of an RDS station already had a radio equipped to receive RDS.

(C) Equipping a radio station with RDS technology does not decrease the station's listening area.

(D) In 1996 Verdlanders who did not own radios equipped to receive RDS could not receive any programming from the RDS radio stations that began broadcasting in Verdland after 1994.

(E) The RDS radio stations in Verdland in 1996 did not all offer the same type of programming.

选项A是什么意思呢？为什么C 不对呢?

chasingM7

A:没有1994年后投入运行的RDS广播站可以把信号传送到原先RDS广播站达不到的区域。

premise 1) 1994-1996, RDS radio station rose to 600 from 250.
            2) RDS-equiped RDS 数量没怎么变

结论：能收到special program的人的数量没变。

negation: 如果信号传到了之前达不到的区域，就有更多的人能收到speical program. 结论不成立。

C: irrelevant

狂威雪

谢谢啦，豁然开朗哈