扫描二维码，直接登录
题库 / Prep2007E2-CR-11
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?
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.
In 1996 most Verdlanders who lived within the listening area of an RDS station already had a radio equipped to receive RDS.
Equipping a radio station with RDS technology does not decrease the station's listening area.
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.
The RDS radio stations in Verdland in 1996 did not all offer the same type of programming.
P: 1994-1996之间：RDS station 从250增加到600，但是RDS radio数量保持不变-> C: 1994-1996之间收听RDS的Verdlanders人数不变
choice a, 很少有电台在1994年以后对之前在RDS stations收听范围之外的radio播报。取非：一些电台在1994年以后对之前在收听范围之外的RDS radio进行播报，weaken conclusion
choice c, 给station 配置RDS不会减少收听范围。取非：配置RDS会减少收听范围，那么原本250的电台，增加到600个以后还是有可能覆盖那么多radios。无法削弱
能够最终决定收听用户数的是radios，不是stations。assumption就是1994年有效radio数量，和1996有效的radio数量基本持平
登录 或 注册 后可以参加讨论