3、集合概念推理 :一个大的集合的两个方面形成对比,两者之间存在着互补性关系,也就是一个的增加意味着另一个的减少。反之,相同。这个比较抽象,我们来看一个例子:
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?
New technological developments had little effect on farmers.
The percentage of the total population working in agriculture declined.
Many farms destroyed in the war were rebuilt after the war.
Farmers achieved new prosperity because of better rural transportation.
文中指出:非农业人口的数量和比例都增加了。由此可知农业人口的数量和比例下降,所以为正确答案。
三、解答这类题目需要注意的信息点:
1.日期和数字。
2.关键词: 表示多少的副词: many , some, much of, several , a few ,most ;情态动词:may, can , could;表示过去的:used to be , was, were , at one time, previously ;表示不是唯一的: not only ,not exclusively等。
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