7．persuade（　�。�
A．usualB．insistC．sugarD．trousers

分析 persuade的音標(biāo)是[p??swe?d]，字母s發(fā)的音是/s/；．

解答 答案：B  usual的音標(biāo)是[?ju：?u?l]，字母s發(fā)的音是/?/； insist的音標(biāo)是[?n?s?st]，字母s發(fā)的音是/s/； sugar的音標(biāo)是[???g?（r）]，字母s發(fā)的音是/?/；trousers的音標(biāo)是[?tra?z?z]，字母s發(fā)的音是/z/．所以本題選擇．

點評 字母s 在不同的單詞中有不同的發(fā)音，所以要注意單詞的正確發(fā)音．

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