Necessary assumption. Use negation.
If you negate A), you have:
Few if any of the RDS radio stations that began broadcasting in Verdland after 1994 DID NOT broadcast to people with RDS-equipped radios living in areas not previously reached by RDS stations.
This is a double negative statement. If that is true, then almost all these stations broadcast to people with RDS-equipped radios living in areas not previously reached by RDS stations. In other words, stations reached out to NEW listeners! If so, the conclusion “the number of Verdlanders receiving the special program information probably did not increase significantly” is wrong. Thus, A) is the necessary assumption.
-- by 会员 sdcar2010 (2011/11/19 21:46:24)
看了这么久，终于把这道题看懂了！
(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
.（懂啦！很犀利哦。广播电台的范围扩大，同时安装有该设备的收音机数量不变，所以说听到该节目的人数不变。有没有跳跃呢？有的，如果之前有人有安装设备，但是也听不到呢？所以，假设是A：几乎没有新增的广播电台覆盖到以前有设备但是接收不到的人中去。取非：有广播电台覆盖到以前有设备但是接受不到的人中去，那么现在接收到节目的人就会增加了，削弱原文。）
(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
.（要注意D这样的陷阱！D只是重复说了一遍原文第一句，不能算作假设条件！）
(E) The RDS radio stations in Verdland in 1996 did not all offer the same type of programming.
-- by 会员 白冬冬 (2012/3/16 20:30:53)
~Thx in advance~
