【单选题】

Passage 2Reading is not the only way to acquire knowledge of preceding work.There is another large reservoir which may be called experience,and one college student will find that every craftsman has something he can teach and will generally teach gladly to any college student who does not look down upon the with illconcealed disdain.The information from these quarters differs from that in textbooks and papers chiefly in that its theoretieal part—the explanations of why things happen—is frequently quite fantastiC、But the demonstration and report of what happens,and how it happens,are sound even if the reports are in completely unscientific terms.Presently the college student will learn,in this case also,what to accept and what to reject,one important thing for a college student to remember is that ifAristotle could talk to the fisherman,so can he.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 explore,for much knowledge and personal expenences needed here to separare good plants from wild weeds.The college students learn to realize and remember how much of real value science has found in this wide,confused wilderness and how often scientific discoveries turned wilderness out to be rediscoveries of what had existed in this wilderness long ago.

A、personal experience
B．wild weeds among good plants
C．the information from the parents
D．the vast store of traditional practies