下列人体实验类型中，不需要付出道德代价的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28433' and id < 2322379 and id<>'2322379' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28433' and id > 2322379 and id<>'2322379' order by id asc limit 5