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原题是：
A child watching television experiences a procession of sights and sounds that flash from the screen just long enough for the eyes and ears to take them in. Unlike the pages of a book, which can be read as slowly or as quickly as the child wishes, television images appear with a relentless velocity that stunts rather than enhances the child's powers of imagination.
The view expressed above is based on an assumption. Of the following, which can best serve as that assumption?
(A) When allowed to choose a form of entertainment, children will prefer reading to watching television.
(B) A child's imagination cannot be properly stimulated unless the child has access both to television and to books.
(C) A child's imagination can develop more fully when the child is able to control the pace of its entertainment.
(D) Children should be taught to read as soon as they are able to understand what they see on television.
(E) A child's reaction to different forms of sensory stimuli cannot be predicted, since every child is different.
题目比较长，我简化了论述是：
The pace cannot be controlled when watching TV -> watching TV stunts a child's imagination
如果我们把“The pace cannot be controlled when watching TV”视为A，“watching TV stunts a child's imagination”视为B，那么题干逻辑就是A -> B，这道题是问assumption，最后的正确答案是(C)，即：否A -> 否B
我的疑问是： 为什么 A -> B 的假设会是 否A -> 否B 呢？按照以前中学数学课的说法：A -> B 应该和 否B -> 否A 等价才对啊，为什么 否A -> 否B 变成答案了呢？还是我理解错了？
请大牛们指点啊！
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发表于 2012-6-25 22:24:14
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