1、By law, when one makes a large purchase, he should have ______ adequate opportunity to change his mind.

　　A.accurate　　B.urgent　　C.excessive　　D.sufficient

　　2、Achieving a high degree of proficiency in English as a foreign language is not a mysterious ______ without scientific basis.

　　A.process　　B.practice　　C.procedure　　D.program

　　3、The generation ______ makes it difficult for parents to understand their children's opinions.

　　A.division　　B.gap　　C.separation　　D.interval

　参考答案&解析：

　　1、D　句意：根据法律规定，当事人购买一大批货物时，他是有权利改变主意的。accurate的意思为“精确的”，urgent的意思为“紧急的，眼前的，急迫的”;excessive的意思为“过分的，过多的”;adequate和sufficient为充足的。

　　2、A　process过程;practice实习，练习，开业;procedure程序;program课程，计划，大纲。

　　3、B　generation gap 代沟;division分，划分;separation分开;interval间隔，间隙;(幕间或工间)休息。at intervals 不时，时时。