英语上字母组合oo的发音都发[u]音.字母组合oo发短音/u/的单词有:classroom,bedroom,good,foot,stood (understood),wood,wool,took,book,look,cook.我们可记忆为:教室、卧室、好、脚、站在木毛上,遇到老K发短音,我们只须把它作为口诀来背诵.另外,同学们特别要注意room和classroom中字母组合oo的发音的区别,我们可以记忆为长词发短音,即classroom /u/,短词发长音room /u:/.