导致肺癌发生最重要的危险因素是（ ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='28286' and id < 2316439 and id<>'2316439' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28286' and id > 2316439 and id<>'2316439' order by id asc limit 5