设f(x)为定义在R上的奇函数，当x≥0时，f(x)= +2x+b(b为常数)，则f(-1)=（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16561' and id < 1395031 and id<>'1395031' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16561' and id > 1395031 and id<>'1395031' order by id asc limit 5