3、框架法。中心法是利用文章中心提出方式来确定整篇文章的主旨。考研英语阅读文章常见的中心提出方式有：

　　方式1："开门见山型"-直接提出主旨，不会迟于第二段。

　　方式2："抛砖引玉型"-以他山之石的观点、故事等引出主旨。

　　方式3："话锋一转型"-转折之后，主旨方显。

　　方式4："设问回答型"-用设问提出问题，以答案呈现主旨。

　　【举例讲解】

　　例：Americans don't like to lose wars. Of course, a lot depends on how you define just what a war is. There are shooting wars-the kind that test patriotism and courage-and those are the kind at which the U.S. excels. But other struggles test those qualities too…

　　Now there is a similar challenge: global warming. The steady deterioration (恶化) of the very climate of this very planet is becoming a war of the first order, and by any measure, the U.S. is losing. Indeed, if America is fighting at all, it's fighting on the wrong side…

　　The rub is, if the vast majority of people increasingly agree that climate change is a global emergency, there's far less agreement on how to fix it. Industry offers its plans, which too often would fix little…

　　Halting climate change will be far harder. One of the more conservative plans for addressing the problem calls for a reduction of 25 billion tons of carbon emissions over the next 52 year…[2009,Text4]

　　56. What does the passage mainly discuss?

　　A. Human wars. B. Economic crisis.

　　C. America's environmental policies. D. Global environment in general.

　　【解析】根据题干特征可知这是一道主旨题，到了冲刺阶段，我们主旨题可利用中心法快速解出。文章首段的复现词是war和Americans /U.S.，主要讲美国人和战争的话题。

　　第二段段首出现了similar，说明文章属于"抛砖引玉"类，后面引出文章主旨，即：global warming，因此初步判定，本文中心讲"global warming"，而且该段还出现了U.S.,说明文章在讨论"美国"和"全球变暖"的问题，只有C选项符合该要求，America's对应U.S.；environmental对应global warming。A项和B项的错误属于以偏概全，D项的错误属于范围过大。

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