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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.
Conclusion: Radio Station increse+RDS Radio remains=receive information remains
Choice A：reverse it! The radio station covers the areas, which did not have the station, then the area receiving the information will increase.
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
题目：1增加，2不变 --> 收听did not increase
A．1增加了数目，但没扩大范围，所以，还是只有2能听到，别人听不到
B．=2不变
C．说decrease，无关，题目只涉及increase
D．1增加，2没有 --> 不能收到 【废话，当然不能，而且注意时间，in 1996。原题时间段94-96。这里只说96，没提94,59，做assumption显然是覆盖面不够的】
E．彻底无关，时间也不对
新建了很多的radio station 但是radio的拥有量没有变=》接收到RDS information的人没有增加
gap：如果这钱有很多人有radio，但是由于station的数量太少，无法reach这些radio，那么新建station就可以改善这个状况
A.没有广播台向那些以前就没被覆盖的地区的人们进行广播，因此接受的人的数量还是原来那些，符合原文逻辑：radio数量不变→接受RDS广播的人数不变。
D选项重复第一句话的意思，没有给出额外补充加强信息。
所以：即使RDS电台数量增加了，在RDS接收器不变的情况下，能到这些信息的听众数量就不会显著增加。
前提：有这种配置的收音机没有增加
结论：增加广播站的数量不会增加收听这种广播的人数
思考方向：因果相关性。能够收听到广播有两个重要因素，一个是有这种配置的收音机，另外一个是有广播站。这两个条件缺一不可。