From a number of recent studies, it has become clear that blind people can appreciate the use of outlines and perspectives to describe the arrangement of objects and other surfaces in space。

可知答案是C。

　　
再看下例：剑桥真题系列V, Question 33 / Test 1.

　　Choose the correct letter, A,B,C or D.

33. What aspect of scientific research does the writer express concern about in paragraph 4?

A、the need to produce results

B、the lack of financial support

C、he selection of areas to research

题干中能令考生感觉详细一点的也就只是 scientific research 了，不过，依照它找到paragraph 4，发现只读和scientific research 有关的句子还是无法作答，首句中的’One is the lopsidedness built into scientific research.’并不能令考生得知”偏颇”的具体内容，而第二句：Scientific funding goes mainly to areas with many problems. 又容易让考生误解为B 也可能成为正确答案，从而在B和C之间举棋不定，难以取舍，因为该题其实是在考核对全段的综合理解能力， 题干中的scientific research并不能认为是一个详细信息点，既然在句尾出现了in paragraph 4.   

　　
此时，题干应被判断为是general 类的，依照前文所述，先读A,B,C,D四个选项。从A与D的内容雷同来看，可以排除这2者的正确性，因为正确答案是唯一的；在B与C之间，它们的差异是非常明显的。这时只需谨记financial 和area，带着问题去读指定段落，任务就显得轻松多了，由段落中的第二句和末句可知答案是C。