答案:The classical theory(1) Four assumptions
The first assumption : categories are defined by a limit-ed set of necessary and sufficient conditions.
2 The second assumption : features are binary.3 The third assumption: categories have clear bounda
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4 The fourth assumption : all members of a category haveequal status.
( 2) DisadvantagesCertain things do not fall into clear-cut categories. For in-stance, do ostriches and penguins belong to the BIRD category?