单选题 Shake1.0ginNo．180powder,with20mlchloroformfor15minutes,filterandreservetheextractedpowderforthepreparationofsolution(2)．Whichofthefollowingisnotcorrectintheprocedures?

• A．本品180号粉末1.08
• B．保留滤过液以供配制溶液(2)用
• C．粉末溶解于氯仿中振摇15分钟
• D．过滤
• E．粉末溶解于氯仿中