旅游安全事故从程度上来看，包括（　　）几个等级。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='50930' and id < 3256321 and id<>'3256321' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='50930' and id > 3256321 and id<>'3256321' order by id asc limit 5