71、本文讲述了三种字典的类型，只在告诉读者如何根据需要去选择字典，故填select。72.根据第二段的第三句话“However, a pocket dictionary doesn't contain enough entries to be adequate for college reference homework.“可知作者认为口袋字典不能用来作为写家庭作业的参考。inadequate for不能够胜任，所以填inadequate。73.根据第二段的第四句话“the information about each word in a pocket dictionary is generally limited.”可知口袋字典里每个单词的意思是有限的，故填word information。74.根据题目中第二个方框中给出的信息可知作者写完pocket dictionary后接着写第第二种字典: desk dictionary。75.根据第第二段的第五句话“A desk dictionary is medium sized, generally containing over 100,000 entries as well as extra features.”可知中等体积的是desk dictionary的外特点，所以填extra features。76.根据第二段的倒数第二句话“Because unabridged dictionaries contain nearly all English words, they are large and heavy.”，故填large and heavy。77.根据第二段的最后一句话“They are often used by schools and libraries.“可知unabridged dictionary适用于学校和图书馆。故填large and heavy。78.根据第三段的第二句话可知英语是一种动态的语言，所以字典也应该及时的更新，允许新的单词加入。故填admitting new words。79.根据第四段的第一句话：In s electing a dictionary ,check the features it offers besides vocabulary definitions.可知题目中最后一个方框里的三条信息所讲的是选择字典时要检查词汇意外的特点，故填check。80. 根据全篇章的最后一句话：Some also contain CD-ROMS and access to special online features.可知，故填access to