进入疟区时，用于病因性预防的首选药是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29756' and id < 2416440 and id<>'2416440' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29756' and id > 2416440 and id<>'2416440' order by id asc limit 5