51. Using many symbols makes it possible to put a large amount of inFORMation on a single map.


  52. Anarchism is a term describing a cluster of doctrines and attitudes whose principal uniting feature is the belief that government is both harmful and unnecessary.


  53. Probably no man had more effect on the daily lives of most people in the Untied States than did Henry Ford a pioneer in automobile production.


  54. The use of well-chosen nonsense words makes possible the testing of many basic hypotheses in the field of language learning.


  55. The history of painting is a fascinating chain of events that probably began with the very first pictures ever made.


巧背英语四级100个句子单词[9]: http://insuns.com/article/17793-1.html