男性，50岁。近1周间断性便血，伴肛门 坠胀感。首先应进行的检查是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32549' and id < 2586605 and id<>'2586605' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32549' and id > 2586605 and id<>'2586605' order by id asc limit 5