Anothersourceofknowledgeisthevaststoreoftraditionalpracticeshandeddown

Another source of knowledge is the vast store of traditional practices handed down from father to son, or mother to daughter, of old country customs, of folklore．All this is very difficult for a college student to examine, for much knowledge and personal experience is needed here to separate good plants from wild grass．The college student should learn to realize and remember how much of real value science has found in this wide, confused wilderness and how often scientific discoveries of what had existed in this area long age．Q：In the last paragraph the phrase“this wide, confused wilderness”refers to ________．A.personal experienceB.wild weeds among good plantsC.the information from the parentsD.the vast store of traditional practices