更新時間：2021-07-14 08:22:04作者：admin2
首先謝謝題主的邀請，在我們廣大GMAT考生備考的時候，往往會對GMAT閱讀部分的邏輯考點，摸不著頭腦。
因為它的出題形式較為新穎，有增強或削弱結論的套路，比如Which of the following, if true, would most weaken/ strengthen the author’s conclusion in lines …? 這種題在部分情況下，會考察為結論補充前提。因此對于許多GMAT備考的考生來說，就會有一定的迷惑性。
那么這種時候我們怎么應對呢？
今天成都申友GMAT的老師就來給GMAT備考的同學們講解，在做這類邏輯題的時候，我們正在GMAT備考中的考生應該如何應對。
首先各位GMAT考生要記住，一定要掌握一個原則，那就是無論增強結論還是削弱結論，都要回到文章中，尋找得到這個結論的前提或者相關信息，然后通過處理前提從而得到增強或者削弱結論的目的。閱讀里面的邏輯題與CR的不同點就在于：我們需要下手增強和削弱的地方都是應該從文中出發尋找，不需要自己補充額外的信息，這樣梳理就相對比較容易了。
所以還有一個很笨的方法教給GMAT備考的考生們，大家根據情況慎用！那就是在最下策的情況下，如果實在不知道應該怎么選，可以從選項出發，看哪個選項與文章內容最相關，這個時候選這個選項，也是相對有把握一點。
舉個例子來看。
A small number of the forest species of lepidoptera (moths and butterflies, which exist as caterpillars during most of their life cycle) exhibit regularly recurring patterns of population growth and decline—such fluctuations in population are known as population cycles. Although many different variables influence population levels, a regular pattern such as a population cycle seems to imply a dominant, driving force. Identification of that driving force, however, has proved surprisingly elusive despite considerable research. The common approach of studying causes of population cycles by measuring the mortality caused by different agents, such as predatory birds or parasites, has been unproductive in the case of lepidoptera. Moreover, population ecologists' attempts to alter cycles by changing the caterpillars’ habitat and by reducing caterpillar populations have not succeeded. In short, the evidence implies that these insect populations, if not self-regulating, may at least be regulated by an agent more intimately connected with the insect than are predatory birds or parasites.
這是一篇GMAT閱讀的第一段，針對這段考了一個邏輯題：
Which of the following, if true, would most weaken the author’s conclusion in lines “In short, … than are predatory birds or parasites.”?
(A)New research reveals that the number of species of birds and parasites that prey on Lepidoptera has dropped significantly in recent years.
(B)New experiments in which the habitats of lepidoptera are altered in previously untried ways result in the shortening of lepidoptera population cycles.
(C)Recent experiments have revealed that the nuclear polyhedrosis virus is present in a number of predators and parasites of lepidoptera.
(D)Differences among the habitats of Lepidoptera species make it difficult to assess the effects of weather on lepidoptera population cycles.
(E)Viral disease is typically observed in a large proportion of the lepidoptera population.
這道題問怎么樣能削弱段中的最后一句話，我們先回到文中找到這句話，里面有一個非常關鍵的詞語In short，表明這句話是由上文得來的，得到的結論是有一個agent能影響種群周期，那么是怎么得到這個結論的呢？我們回到上文看一下。當研究種群周期的影響因素的時候，文中指出common approach是unproductive，而且進一步指出，population ecologists' attempts也是not succeeded。正是因為這兩個方法都不行，我們才得到有agent的影響。那么要削弱這句話，只要表明上文的其中一個方法是可行的，那么agent就不起作用了。這個時候來看看選項，
A，討論的是birds and parasites的數量變化，但這個變化不能說明研究方法的有效性，無關排除。
B，新的試驗表明，以一種之前沒有嘗試過的方法改變棲息地，使得種群周期減少。這個選項影響了種群周期，而且棲息地是之前population ecologists的嘗試，那么這個嘗試有效了，也就不用agent了，可以削弱。
C，討論的是NP virus數量很大，結合下文NP virus就是agent，那么自然不能削弱。
D，討論的是天氣的影響，無關排除。
E，Viral disease數量大，也是無關排除。
因此這道題應該要選B。
所以在GMAT備考中，閱讀題邏輯考點應如何突破呢？相信題主還有其他備考GMAT的同學們看完本文也都能深有體會，找到突破口了，那就是GMAT閱讀里的邏輯題在判斷選項的時候，應該選擇與結論最相關的一項。無論是增強還是削弱在文中都能找到信息對應，大家能帶著這個思路做題，那么邏輯題也就能輕松攻破了。