题目内容：
回答题：Readingis not the only way to gain knowledge of the work in the patst．Thereis another largereservoir(知识库)which may be calledexperience，and the college stu lent will find thateverycraftsman(工匠)has something he can teach and willgenerally teach gla(1y to any college studentwho does not look down upon them．But the demonstration(示范)and report of whathappens，and how it happens are correct even if thereports are in completely uns fientific terms(术语)．Presently the college student will learn，inthis case als0，what to accept；mdwhat to reject．
Anothersource of knowledge is the vast store of traditional practices!landed down fromfatherto son，or mother to daughter，ofold country customs，of folklore(风俗)．All this is very diffi-cult for a collegestudent to examine，for much knowledge and personalekperience is needed hereto separate good plants from wild gra’ss．The college student should learn to realize and rememberhow much ofreal value science has found in this wide，confusedwilderness．
In the last paragraph thephrase“this wide，confused wilderness”refers to__________． A．personal experience
B．wild weeds among good plants
C．the information from the parents
D．the vast store of traditionalpractices
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