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单词：

Roy [rɔi] boy [bɔi]join [dʒɔin]oil [ɔil]

voice [vɔis]loyal ['lɔiəl] Joy [dʒɔi]toy [tɔi]

poison ['kɔizn] enjoy [in'dʒɔi]boycott ['kɔi‚kət]foil [fɔil]

句子：

1.Roy is a busboy and so is Joyce.

2.What was employed to destroy the Troy?

3.The noise of Detroit is so annoying.

对比练习：

[ai][ɔi]

byeboy

Kylecoil

filefoil

alliesalloys

implyemploy

friedFreud

nicenoise

tie toy

vicevoice

try Troy