求助这个题，太绕了

dakuandakuan

谁能帮忙解释这个题
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?
AFew 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.
BIn 1996 most Verdlanders who lived within the listening area of an RDS station already had a radio equipped to receive RDS.
CEquipping a radio station with RDS technology does not decrease the station's listening area.
DIn 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.
EThe RDS radio stations in Verdland in 1996 did not all offer the same type of programming.


答案是Ａ　都没看懂　　谢谢解释

薄荷0816

题目说的是 special program information只有安装了RDS才能接受的到。在1994到1996这种提供special program的电台在V从250到了600.但是在V安装了RDS的数量没有变化，所以在能接受到 special program information的数量也不会有明显的变化。（因为第一句的前提）。

Assumption 基本做法取非变削弱。A 说的是1994之后开的提供special program的电台很少有在之前没有覆盖的范围之内。取非就是这些电台大都在之前不覆盖的范围内，所以范围大了就不能确定能接受到special program information的数量数量了，削弱。

ashlyzhu

前提：station只播放广播给装了RDS的radio.
         station(电台)从250增加到600。
        but，RDS的radio却没有变。
结论：那么收到广播的的人不变。
这里面有一个gap,就是并不是所有的人（尽管他们有RDS radio）在1994年都能收到广播啊。如果总共十个人有RDS radio，但是只有7个能收到广播，自从电台增加了后，剩下的3个也能收到广播，那么收到广播的人就从7个变成10个人了。
所以要加强的话，必须把这个GAP拿掉，也就是A，也就是说之前收不到广播的人还是收不到广播，这样收到广播的人数就不变了。。。
         

dakuandakuan

thank you so so so much two NN

primenumbery

我有个疑问 D － 如果仅仅是事实重复，那GMAC也太扯了吧
如果新一代radio不equipped RDS了呢但一样能接收了呢？
万一1996年开始，新一代radio可以接受了呢？
就像DVD player也可以放CD － 你不能说听CD的人减少了，我这里随便举个例子