The book isn't intended for general readers probably because the author too many scientific terms(术语) in it.
A. wrote
B. employed
C. analyzed
D. introduced
网友回答
A. wrote
(答案→)B. employed
C. analyzed
D. introduced
解析：考查动词：A. wrote写B. employed雇佣，使用C. analyzed分析D. introduced介绍，句意：这本书不适合一般的读者，可能是因为作者使用了太多的科学术语在里面，选B。