求助牛牛们一道语法

栖叶泠风

Background information:  This year, each film submitted to the Barbizon Film Festival was submitted in one of ten categories.  For each category, there was a panel that decided which submitted films to accept.

Fact 1:  Within each category, the rate of acceptance for domestic films was the same as that for foreign films.

Fact 2:  The overall rate of acceptance of domestic films was significantly higher than that of foreign films.

In light of the background information, which of the following, if true, can account for fact 1 and fact 2 both being true of the submissions to this year’s Barbizon Film Festival?

A.      In each category, the selection panel was composed of filmmakers, and some selection panels included no foreign filmmakers.

B.      Significantly more domestic films than foreign films were submitted to the festival.

C.      In each of the past three years, the overall acceptance rate was higher for foreign than for domestic films, an outcome that had upset some domestic filmmakers.

D.      The number of films to be selected in each category was predetermined, but in no category was it required that the acceptance rate of foreign films should equal that of domestic films.

E.       Most foreign films, unlike most domestic films, were submitted in categories with high prestige, but with correspondingly low rates of acceptance.

为什么选E呢？完全没搞懂

francoiswang

恩，顶楼上，交给不同的category的film的数目不同。F正好背运，大多数影片交给一个有专家权威的category，而那个category的通过率超低，而D只有一少部分交给那个category

rickywang

顶prayer，举个例子：
如果D和F数量都是100
category1的通过率是80%；category2的通过率是20%
又，D有80部参加category1,20部参加category2
      F有20部参加category1,80部参加category2
如果对于D和F，每个category的通过率一致
  则：category1中，D有64部选中，F有16部选中
        category2中，D有4部选中，F有16部选中
则：D共有68部入选，F有32部入选
     overall rate：D=68/100, F=32/100，即总体上，D的入选率高于F。

xsvictoryme

这题rate是指水平的意思，而不是指比率，我也是纠结许久才想出来的

prayer

http://forum.chasedream.com/GMAT_CR/thread-179316-1-4.html

prayer

那两个条件说的是：每一个分类里面，rate是一样的；总的概率d的比f的多。
B里说的是数量，但是条件里已经说了概率一样，所以数量无关；
E里说大多数的D所在的分类容易被抽到，分类的概率高了，D的概率也就高了