以下就以剑桥雅思1 Practice Test 4中的Reading Passage 1为例解释上述有效话题方法如何进行:
该篇阅读文章A段主题已给出,以下从B段开始分析每段的一二以及末句
B. On the horizon are optical computers. These could store programs and process information by means of light - pulses from tiny lasers - rather than electrons.... It is the surge in fibre optic use and in liquid crystal displays that has set the U.S. glass industry to building new plants to meet demand.
在这里发现一二两句话题一样,无需讨论,末句话题发生变化,而且在意义上包含了一二句的话题,因为optical computers是fibre optic use的一种用法,分总类型。所以最后该段的主旨定义为fibre optic use方面的发展。
C. But it is not only in technology and commerce that glass has widened its horizons. The use of glass as art, a tradition spins back at least to Roman times, is also booming.He now has a new commission - a glass sculpture for the headquarters building of a pizza company - for which his fee is half a million dollars
本段只在第二句话中出现有效话题,那么本段的主题就是本句中的art
D. But not all the glass technology that touches our lives is ultra-modern. Consider the simple light bulb; at the turn of the century most light bulbs were hand blown, and the cost of one was equivalent to half a days pay for the average workerIn this way, the envelope of a light bulb is made by a single machine at the rate of 66,000 an hour, as compared with 1,200 a day produced by a team of four glassblowers.
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