※ 引述《danyuchn (Javy)》之銘言：
在GMAT的CR世界裡，除了GMAT慣常的出題元素（例如另有他因、倒果為因、動態平衡...）之外，有時候，掌握某些常理中的邏輯概念，就能快速排除無關選項。
這次要介紹的概念，可以用在explain題之上。尤其是當矛盾事實在講「兩者差異」或者找「矛盾事件起因」的。這個概念就是：無風不起浪。
這次要介紹的概念，可以用在explain題之上。尤其是當矛盾事實在講「兩者差異」或者找「矛盾事件起因」的。這個概念就是：無風不起浪。
上色＋題目示範完整版：http://dustingmat.blogspot.tw/2016/01/cr-1.html
做CR花一分鐘到一分半來做並不困難。
做CR花一分鐘到一分半來做並不困難。
「閱讀文章找到核心概念與套路->對應到該套路相應的邏輯基本概念來初步刪去選項->
最後留下的選項再去深入故事思考合理性」
以上，就是CR題的基本三步走。
今日的諮詢時間中，討論到了另一題CR題。其實也是「無風不起浪」原則的運用。
Although computers can enhance people’s ability to communicate, computer games are a cause of underdeveloped communication skills in children. After-school hours spent playing computer games are hours not spent talking with people.
最後留下的選項再去深入故事思考合理性」
以上，就是CR題的基本三步走。
今日的諮詢時間中，討論到了另一題CR題。其實也是「無風不起浪」原則的運用。
Although computers can enhance people’s ability to communicate, computer games are a cause of underdeveloped communication skills in children. After-school hours spent playing computer games are hours not spent talking with people.
(這句話只告訴我們：下課打電動的小孩不會花時間跟人說話。但卻沒有說不打電動的小孩是否就會花時間跟人說話。屬於沒有點出差異。）
Therefore, children who spend all their spare time playing these games have less experience in interpersonal communication than other children have.
Therefore, children who spend all their spare time playing these games have less experience in interpersonal communication than other children have.
（結論直接推出比較：「打電動的小孩比不打電動的小孩更不具人際溝通的經驗」）
The argument depends on which of the following assumptions?
「無風不起浪」原則：只有差異才能推得差異。所以要補上假設推得結論，前面premise缺乏的一個條件就是「證明兩種小孩有差異。」
因此正確答案：
(C) Children who do not spend all of their after-school hours playing computer games spend at least some of that time talking with other people.
「下課沒有把時間都花在打電動上的小孩，至少會去跟別人說說話」跟文章裡的第二句話結合，證明了「兩種小孩的差異」這樣才有可能推出結論的差異。
因此正確答案：
(C) Children who do not spend all of their after-school hours playing computer games spend at least some of that time talking with other people.
「下課沒有把時間都花在打電動上的小孩，至少會去跟別人說說話」跟文章裡的第二句話結合，證明了「兩種小孩的差異」這樣才有可能推出結論的差異。
