To measure the effects of Internet-based distractions during class, researchers, evaluated 500 students taking an introductory psychology class at michigan State University.
2018年12月六级真题（第二套）阅读
柯林斯高阶英汉双解学习词典释义
ADJ
引言的;导论的;介绍性的
An introductory remark, talk, or part of a book gives a small amount of general information about a particular subject, often before a more detailed explanation.