GRE閱讀邏輯真題解析

 邏輯題的本質(zhì)在GRE真題班上做過闡述，此處不再贅述，看幾道真題和解析，以下邏輯題和解析均選自GRE真題班。

此題很多機經(jīng)上的流傳的答案有誤。本文對此做詳細(xì)解析。

A decrease in face-to-face social contact can precipitate depression. Time spent using the Internet cannot be spent in face-to-face social contact, so psychologists have speculated that sharply increasing Internet use can cause depression. Studies of regular Internet users have found a significantly higher incidence of depression among those who had recently doubled the amount of time they spent using the Internet than among those whose use had not increased. Hence, the psychologists’ speculation is correct.

1.Which of the following is an assumption on which the argument depends?

A.In general, the reason that the people in the studies had doubled their In- ternet use was not that they had earlier experienced a significant decrease in opportunities for face-to-face social contract.

B.A sharp decrease in face-to-face social contact is the only change in daily activity that can lead to an increased incidence of depression

C.Using the Internet presents no opportunities for people to increase the amount of face-to-face social contact they experienced in their daily lives.

D.Regular Internet users who are depressed will experience an immediate im- provement in mood if they sharply decrease the amount of time they spend on the Internet.

E.Before they doubled the time they spent on the Internet, the people who did so were already more prone to depression than are regular Internet users in general.

請先想一想，再往下拉答案

答案：C。

原文的推理是：(1)上網(wǎng)的時間不能用來社交，所以上網(wǎng)可以導(dǎo)致社交時間的減少;(2)社交時間減少可以導(dǎo)致抑郁(這一點直接第一句話給出，難以反駁)。把這兩點放一起，得出結(jié)論上網(wǎng)可以導(dǎo)致抑郁。

第一點有個問題，沒錯，上網(wǎng)的時間不能用來社交，但是如果上網(wǎng)的內(nèi)容導(dǎo)致社交時間的增多的話，那么，上網(wǎng)就有可能導(dǎo)致社交時間的增加，舉個簡單的例子，如果本身你周末打算一個人在家里刷題，但是周五晚上在網(wǎng)上看到一個新電影的廣告，結(jié)果周末和女/男朋友出去看電影去了，反而導(dǎo)致了社交的時間增加。所以原文推理的假設(shè)就是：不能允許這種漏洞的存在：即必須假設(shè)上網(wǎng)的內(nèi)容本身對社交本身沒有影響，即C。

A要求不能有其他因素導(dǎo)致上網(wǎng)時間增加，這個并非必須，這個是推理鏈接中第一鏈接中的起點，與論證是否成立無必然聯(lián)系;B對邏輯論證的要求好比，“節(jié)食可以減肥”必須要求其他因素不能減肥，但這顯然是荒誕的，“運動可以減肥”無法反駁“節(jié)食可以減肥”，所以B要求唯一并非必須。

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