生物体中含量最丰富的生物大分子是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31090' and id < 2499927 and id<>'2499927' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31090' and id > 2499927 and id<>'2499927' order by id asc limit 5