SAT阅读题目总体而言可以分为两大类：整体(the passage as a whole)和局部(specific parts of the passage)，后者体现了现行SAT对文本细读能力的考察，College Board也对其中一类题目进行了定义：reading closely: These questions focus on the explicit(明确) and implicit(隐含) meaning of text and on extrapolating(推断) beyond the information and ideas in a text。
OG中涉及的此类型题目共38道，解题时需要(1)定位;(2)排除。我们来看其中一类稍难的： determining implicit meaning(识别隐含信息)。官方给出的定义是： The student will draw reasonable inferences and logical conclusions from text. 许多学生觉得推断到什么程度比较难把握，但我们只要定位到原文并紧扣原文进行比较，便会得出答案。请看例句：
OG test4 question 8
The question the narrator asks in lines 30-31 (“will it … railway”) most nearly implies that
A. balloons will never replace other modes of transportation
B. the North Pole is farther away than the cities usually reached by train
C. people often travel from one city to another without considering the implications
D. reaching the North Pole has no foreseeable benefit to humanity
解析：
(1)首先通过行号(lines 30-31)定位到原文：“Will it carry you from Gothenburg to Malmo like a railway?” 意思是它(North Pole)会像铁路一样把你从G地带到M地吗?并问其imply(暗示)了什么信息。只看这一个问题会不知所云，我们可以再看与它同时出现的并列的其他问题“What I don’t understand is why I am so intent(坚决的) on going to this particular place. Who wants the North Pole! What good is it! Can you eat it?”
(2)A选项原文不涉及balloon与其他方式的replace(取代)的问题，排除;B选项原文出现train的同义词，但没有比较远近，而且意义过于表面，排除;C选项比较有迷惑性，有多位同学错选过，但对照原文的”what good is it! Can you eat it?”, 是在思考做这件事情的意义是什么，所以without considering错，可以排除;D选项通过原文的“它能吃吗?”的反问句间接说明了这件事情没有可预见的好处，与原文相符，所以正确。
这篇文章的整体行文思路与美国官方教材collections中的“600 miles to Timbuktu”非常相似，各位同学可以进行比较阅读。
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