A.prescriptive B.analytic C.descriptive D.linguistic
A.in linguistic evolution, speech is prior to writing B.speech plays a greater role than writing in terms of the amount of information conveyed C.speech is always the way in which every native speaker acquires his mother tongue D.All of the above
A.displacement B.duality C.flexibility D.cultural transmission
A.Arbitrariness B.Displacement C.Duality D.Meaningfulness
A.learning B.teaching C.books D.both A and B
