导游服务的作用包括（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26640' and id < 2218949 and id<>'2218949' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26640' and id > 2218949 and id<>'2218949' order by id asc limit 5