大全P186的问题

lisiberry

Six months or so after getting a video recorder, many early buyers apparently lost interest in obtaining videos to watch on it. The trade of businesses selling and renting videos is still buoyant, because the number of homes with video recorders is still growing. But clearly, once the market for video recorders is saturated, businesses distributing videos face hard times.

Which of the following, if true, would most seriously weaken the conclusion above?

(A) The market for video recorders would not be considered saturated until there was one in 80 percent of homes.
(B) Among the items handled by video distributors are many films specifically produced as video features.
(C) Few of the early buyers of video recorders raised any complaints about performance aspects of the new product.
(D) The early buyers of a novel product are always people who are quick to acquire novelties, but also often as quick to tire of them.
(E) In a shrinking market, competition always intensifies and marginal businesses fail.

OA：D
不知道为啥选D。

lisiberry

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穆汐寒

下午的时候再来看看

alzn2765

统计枚举题：由某个局部的特例，推整体的普适。

many early buyers的喜新厌旧能代表all consumers in the market的behavior吗？
如果我想证明不是这样是不是需要说明many early buyers是特例？也就是说many early buyers跟all other consumers in the market的不同？选项是不是要说many early buyers？

(D) The early buyers of a novel product are always people who are quick to acquire novelties, but also often as quick to tire of them.

lisiberry

alzn2765 发表于 2017-3-6 13:16
统计枚举题：由某个局部的特例，推整体的普适。

many early buyers的喜新厌旧能代表all consumers in the  ...

您说的这层意思我也想到了，但是D并没有明说其他的buyer是不是跟early buyer一样也是喜新厌旧呀。
有些人看到了新品上市，也不急着买，有可能买完以后也不看呀。因此认为D不太严密。

RRZZR

lisiberry 发表于 2017-3-7 02:50
您说的这层意思我也想到了，但是D并没有明说其他的buyer是不是跟early buyer一样也是喜新厌旧呀。
有些人 ...

weaken类题型的本质不是要destroy the argument，而是seriously reduce the likelihood that the argument stands

weaken的答案不需要你所说的"严谨"的must destroy，只需要有可能destroy the argument就可以了

按照你的意思，尽管D在你说的情况下有可能不destroy，但仍有那么一些可能destroy，这已经足以constitute weaken的选项了。

lisiberry

RRZZR 发表于 2017-3-7 04:46
weaken类题型的本质不是要destroy the argument，而是seriously reduce the likelihood that the argument ...

明白了，谢谢。
而且跟其他选项比，这个选项比较好。

alzn2765

RRZZR 发表于 2017-3-7 04:46
weaken类题型的本质不是要destroy the argument，而是seriously reduce the likelihood that the argument ...

我把你说的说的再“逻辑”一些：
weaken根据weaken的对象不同，对conclusion的impact也不同：
weaken assumption时：因为assumption是conclusion成立的必要条件，所以weaken assumption根据在挖conclusion的祖坟。其结果是conclusion必不成立。
weaken除了assumption的其他GMAC认定有效的成分时：weaken只是让conclusion成立的可能性变小。此时weaken是conclusion不成立的既不充分也不必要条件。