zhangmile

抓住文章逻辑框架

观点：1965年以前，地理学家们假设两块巨大的岩石版块在SAF相遇，并摩擦中生热

发现：H发现在SAF边的温度并没有预期中的高

于是，引出第一种解释：因为有CLAY的存在，温度不够高

第二种解释：压力解释说

这样这几考题都明了了啊！

zhangmile

首先，先判断文章的类型，
读了第一段之后可以确定，此文为新老观点型

其次，确定文章的TOPIC SENTENCE.
在GMAT的阅读中，文章的起承转合非常重要，主要体现在however, but, yet, although  这四个词上
But 在两个地方需要警觉

1. 出现在一段之首，说明这一段有历史性大转折，和前段所讲的内容完全不是一个范畴，比如一个全新的观点，本文符合此规律

but in 1965 Henyey found that
temperatures in drill holes near the
fault were not as elevated as had
been expected.


为本文的TS(TOPIC SENTENCE)

即解答了.The passage is primarily concerned with
B.discussing explanations for an unexpected scientific finding
（but in 1965 Henyey found that temperatures in drill holes near the fault were not as elevated as had been expected.的同意替换）