GMAT 邏輯題其實是很難通過考生自己閉門造車就獲得進步提升的。因為大傢的思維方式相對固定，想要轉換改變並不是輕松的事情。因此考生在解答邏輯題時最好多找一些帶有權威解析說明的題目資料才能真正有所收獲。下面小編就為大傢帶來 GMAT 邏輯名師精選的高頻考點各題型難題的實例分析，為大傢講解邏輯難點題型的解題思路和技巧。
例題分享：
Normally, the pineal gland governs a person ’ s sleep-wake cycle by secreting melatonin in response to the daily cycle of light and darkness as detected by the eye. Nonetheless, many people who are totally blind due to lesions in the visual cortex of the brain easily maintain a 24-hour sleep-wake cycle. So the neural pathway by which the pineal gland receives information from the eye probably does not pass through the visual cortex.
For purposes of evaluating the argument it would be most useful to establish which of the following?
( A ) Whether melatonin supplements help people who have difficulty maintaining a 24-hour sleep cycle to establish such a pattern
( B ) Whether the melatonin levels of most totally blind people who successfully maintain a 24-hour sleep-wake cycle change in response to changes in exposure to light and darkness
( C ) Whether melatonin is the only substance secreted by the pineal gland
( D ) Whether most people who do not have a 24-hour sleep-wake cycle nevertheless have a cycle of consistent duration
( E ) Whether there are any people with normal vision whose melatonin levels respond abnormally to periods of light and darkness
題目類型：
evaluate the argument
題目翻譯：
通常，PG 通過分泌 M 來控制一個人的睡 - 醒循環，而 M 是眼睛所探測到的光暗的反應。然而，許多因為大腦視覺皮質受到損傷致盲的人可以很容易地維持 24 小時的睡 - 醒循環。所以，從眼睛到 PG 的神經傳導可能不通過大腦的視覺皮質。以下哪一項最有助於評估這段論述的正確性 ?
解題思路：
無既定思路，逐項分析。
逐項分析：
A、M 並非越多越好，補充 M 有可能導致過量，故無法得出確切結論，排除。
B、正確選項。符合題幹主旨。
C、M 是不是 PG 分泌的唯一物質。無關項。
D、沒有 24 小時睡 - 醒循環的人是不是有他們特定的周期。無關項。
E、對光暗的異常可能有很多原因，不一定是視覺皮質引起的，排除。
正確選項：
B
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