为了降低基差风险，应选择合适的期货合约，包括（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25449' and id < 2143426 and id<>'2143426' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25449' and id > 2143426 and id<>'2143426' order by id asc limit 5