光合作用中释放的氧来源于（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25861' and id < 2171234 and id<>'2171234' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25861' and id > 2171234 and id<>'2171234' order by id asc limit 5