2.關鍵詞： 表示多少的副詞: many , some, much of, several , a few ,most …;情態動詞：may, can , could…;表示過去的：used to be , was, were , at one time, previously ;表示不是唯一的： not only ,not exclusively等。
例如：Both the number and the percentage of people in the United States involved in nonagricultural pursuits expanded rapidly during the half century following the civil war, with some of the most dramatic increases occurring in the domains of transportation, manufacturing, and trade and distribution.
What can be inferred from the passage about the agricultural sector of the economy after the Civil War?
(A) New technological developments had little effect on farmers.
(B) The percentage of the total population working in agriculture declined.
(C) Many farms destroyed in the war were rebuilt after the war.
(D) Farmers achieved new prosperity because of better rural transportation.
一、託福閱讀推理題可分為兩類：有共性的推理題和無共性的推理題
這裡所謂的有共性推理題就是說題幹中有和原文內容相同的關鍵詞(也叫線索)。根據關鍵詞回原文定位，然後進行推理。一般來說，大多數的推理題都屬於這類題目。對於無共性的推理題，也就是題幹中無線索，一般使用排除法，即根據各個選項的關鍵詞回原文定位，透過排除法得出正確答案。返回原文找資訊點，採用排除法是解決這兩類題型解決的共同策略。
二、解答託福閱讀推理題需要注意的資訊點
1.日期和數字。
2.關鍵詞： 表示多少的副詞: many , some, much of, several , a few ,most …;情態動詞：may, can , could…;表示過去的：used to be , was, were , at one time, previously ;表示不是唯一的： not only ,not exclusively等。
三、託福閱讀推理題的三個具體的解題思路
1、一般對比推理：根據兩個事情的對比特徵，問其中一個事物的特徵，只要將與之形成對比的另外一個事情的特徵否定掉就可以。
2、時間對比推理：在這種推理中，一般有兩個形成對比的時間段，它們所具有的特徵一般相反。當題幹問一個時間段的特徵時，只要將與之相反的時間段的特徵否定掉就可以了。
3、集合概念推理 ：一個大的集合的兩個方面形成對比，兩者之間存在著互補性關係，也就是一個的增加意味著另一個的減少。反之，相同。這個比較抽象，我們來看一個例子：
例如：Both the number and the percentage of people in the United States involved in nonagricultural pursuits expanded rapidly during the half century following the civil war, with some of the most dramatic increases occurring in the domains of transportation, manufacturing, and trade and distribution.
What can be inferred from the passage about the agricultural sector of the economy after the Civil War?
(A) New technological developments had little effect on farmers.
(B) The percentage of the total population working in agriculture declined.
(C) Many farms destroyed in the war were rebuilt after the war.
(D) Farmers achieved new prosperity because of better rural transportation.
文中指出：非農業人口的數量和比例都增加了。由此可知農業人口的數量和比例下降，所以(B)為正確答案。