question: concept:definition
choices.label: A B C D
choices.text: truth:theorem induction:generalization abstract:concrete purpose:result
explanation: each "concept" corresponds to a corresponding "definition". each "truth" corresponds to a corresponding "theorem". the methods of summary include "induction" and "generalization". "abstract" refers to the visual effect produced by simplifying or rearranging the appearance of natural objects. "concrete" is the basic image active in the minds of writers and artists in the process of literary and artistic creation. "abstract" and "concrete" are artistic characteristics. every "purpose" does not correspond to a corresponding "result".
relation: concept definition R3.10
relation: truth theorem R3.10
relation: induction generalization R2.4
relation: abstract concrete R2.4