已看过原有链接，还是不解。B和D到底该如何理解。
ps,Og的解释关于B和D 也没看明白。请NN不吝指教。谢谢
28. Fact 1: Television advertising is becoming less effective: the proportion of brand names promoted on television that viewers of the advertising can recall is slowly decreasing.
Fact 2: Television viewers recall commercials aired first or last in a cluster of consecutive commercials far better than they recall commercials aired somewhere in the middle.
Fact 2 would be most likely to contribute to an explanation of fact 1 if which of the following were also true?
Fact 2 would be most likely to contribute to an explanation of fact 1 if which of the following were also true?
A. The average television viewer currently recalls fewer than half the brand names promoted in commercials he or she saw.
B. The total time allotted to the average cluster of consecutive television commercials is decreasing.
C. The average number of hours per day that people spend watching television is decreasing.
D. The average number of clusters of consecutive commercials per hour of television is increasing. E
E. The average number of television commercials in a cluster of consecutive commercials is increasing.
28.
Because E indicates that the number of commercials in a cluster is increasing, it entails that proportionally more commercials are aired in intermediate positions. Hence, E helps fact 2 explain fact 1 by showing that increasingly more commercials are aired in positions in which viewers find them difficult to recall. E is the best answer.
A testifies to the ineffectiveness of television advertising but does not help fact 2 explain fact 1. B indicates that fact 2 contradicts rather than explains fact 1, since it suggests that the number of commercials per cluster is decreasing. C and D help to explain fact 1-by describing a change in viewing habits and a change in programming-but neither relates fact 2 to fact 1.
已看过原有链接，还是不解。B和D到底该如何理解。
ps,Og的解释关于B和D 也没看明白。请NN不吝指教。谢谢
已看过原有链接。但还是不懂B和D，请NN不吝指教。谢谢。
B. The total time allotted to the average cluster of consecutive television commercials is decreasing. 分给平均一组连续的广告的总时间减少。 以前一组广告给10分钟，现在每组广告打5分钟。－不论打几分钟的广告，看电视的人反正只是记得最前面和最后面的广告。这个和Fact 2联系在一起不能解释1：为什么人们记住广告的比例降低。（按照二的说法：比例＝人们记住的广告（namely,前面广告＋后面广告）/总的广告数量 D.The average number of clusters of consecutive commercials per hour of television is increasing. 每小时电视中连续的广告组数的平均数增加。 以前每小时电视节目中可能平均插播三组广告，现在每个小时里面插播四组。－不管插播几组，每组里面的广告数量我们是不知道的。按照上面的公式，不能算出来说比率降低。
分给平均一组连续的广告的总时间减少。
以前一组广告给10分钟，现在每组广告打5分钟。－不论打几分钟的广告，看电视的人反正只是记得最前面和最后面的广告。这个和Fact 2联系在一起不能解释1：为什么人们记住广告的比例降低。（按照二的说法：比例＝人们记住的广告（namely,前面广告＋后面广告）/总的广告数量
D.The average number of clusters of consecutive commercials per hour of television is increasing.
每小时电视中连续的广告组数的平均数增加。
以前每小时电视节目中可能平均插播三组广告，现在每个小时里面插播四组。－不管插播几组，每组里面的广告数量我们是不知道的。按照上面的公式，不能算出来说比率降低。
以前广告打10分钟，现在只打五分钟了，给广告的时间少了，那么广告的数量也会少了。在这样的情况下，人们应该记住的比例会升高（根据 “人们记住的广告/广告总量”）；但是这个和FACT1所说的contradict了。
got it . Thanks a lot!!
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