美声唱法源于(    )，它追求声音效果，讲究发声方法，注意运用华彩和装饰唱法。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='2900' and id < 222543 and id<>'222543' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='2900' and id > 222543 and id<>'222543' order by id asc limit 5