For example it has long been known that total sleep ______ is 100 percent fatal to rats, yet, ______examination of the dead bodies, the animals look completely normal. A re-searcher has now ______the mystery of why the animals die. The rats ______bacterial in-fections of the blood, _______ their immune systems-the self-protecting mechanism against disease-hed crashed.
A. subtle B. obvious C. mysterious D. doubtful
4）关联结构法
关联是完形文章中经常出现的一种结构，即将两个或两个以上的同类别词语，比如两个动词、两个形容词，以连续排比性的结构出现。在这种情况下，两个关联词汇在句子中的语法地位一样，常起一样的语法作用，之间又明显具有某种逻辑关系。关联的解题意义在于：出题人一般会将一个关联词语设置成已知信息，另一个是未知的，这样那个已知的词语就成为破解未知词语的关键线索。
Companies ______ (with) low accident rates plan their safety programs, work hard to organize them, and continue working to keep them ______ and active,
A. alive B. vivid C. mobile D. diverse
1） 时间线索定位法
完形文章中出现的时间信息一般都是非常有用的线索，因为只要通过分析这些时间线索就可以很快把握与这些时间线索联系在一起的信息之间的关系。
But they insisted that its (指工业革命) ______ results during the period from 1750 to 1850 were widespread poverty and misery for the ______ of the English population. ______contrast, they saw in the preceding hundred years from 1650 to 1750 , when England was still a ______ agricultural country, a period of great abundance and prosperity.
A. momentary B. prompt C. instant D. immediate
A. broadly B. thoroughly C. generally D. completely
It is generally recognized, however, that the introduction of the computer in the early 20th century, ______ by the invention of the integrated circuit during the 1960s, radically changed the process.
