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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.
D说的是any programme，题目说的是special programme，所以其实是无关项
要收到special programme有两个条件：1. 在RDS radio station范围内 2. radio带RDS功能。题目只说了因为条件2没变所以收到的人没变，但忽略了条件1.
选项A取非说明了因为增加了radio station，所以很多有RDS功能的radio只不过是因为以前不在station范围内，现在在station范围了那就收到了，即收听到special programme的人会增加。取非削弱了结论。
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