The term “vocabulary” is used in different senses.  It can stand

The term “vocabulary” is used in different senses.  It can stand for all the words used in a certain( ) period, e.g. Old English vocabulary, Middle English vocabulary and Modern English vocabulary. 
【正确答案】：HISTORICAL
【题目解析】：词汇”一词用在不同的意义上。它可以代表一定历史时期使用的所有单词，如古英语词汇、中古英语词汇和现代英语词汇。