9577Respiration plays a key role__________ 查看材料A.by ke789

Respiration plays a key role__________ 查看材料 A.by keeping its original shape and colour B.in the life of the cut flower C.to produce carbon dioxide D.for as long as possible E.by controlling temperature F.to replace the water and solution every day 请帮忙给出正确答案和分析，谢谢！