後一句再回應文章中的重點oligosaccharin 是specific 以此concept 來做答 (A) To stimulate a particular plant cell to become part of a plant’s root system (oligosaccharin是specific ß> particular ) (B) To stimulate the walls of a particular cell to produce other oligosaccharins（oligosaccharin 是由enzymes release 的詳見L37） (C) To activate enzymes that release specific chemical messengers from plant cell walls（詳見L36--37） (D) To duplicate the gene complement in a particular plant cell（有嗎?） (E) To produce multiple effects on a particular subsystem of plant cells（oligosaccharin是specific）
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