我们先来看几个例子
1. 题目:Research completed in 1982 found that in the United States soil erosion
A reduced the productivity of farmland by20 per cent
B was almost as severe as in India and China
C was causing significant damage to 20 per cent of farmland
D could be reduced by converting cultivated land to meadow or forest
原文:The United States, where the most careful measurements have been done, discovered in 1982 that about one-fifth of its farmland was losing topsoil at a rate likely to diminish the soils productivity.
很明显,原文是一个长句,而对于长句的处理就是找出主干,我们可以看出来,这个句子的主干是The United States discovered in 1982 that about one-fifth of its farmland was losing topsoil。所以答案就非常明显应该选择C。所以你会发现很多考生都会选的A项经过对此长句的分析,它根本就不在此长句的主干,也就是说这是对作者要表达的意思的补充说明。从这里我们可以看出,出题者对干扰项的出题思路,干扰项所在的位置都是定位句子的非主干部分。
2.题目:Paragraph B How the port changes a citys infrastructure
原文:Port cities become industrial, financial and service centers and political capitals because of their water connections and the urban concentration which arises there and later draws to it railway, highways and air routes. Water transport means cheap access, the chief basis of all port cities. Many of the worlds biggest cities, for example, London, New York, Shanghai, Istanbul, Buenos Aries, Tokyo, Jakarta, Calcutta, Philadelphia and San Francisco began as portsthat is, with land-sea exchange as their major functionbut they have since grown disproportionately in other respects, so that their port functions are no longer dominant. They remain different kinds of places from non-port cities and their port functions account for that difference.
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