These theorists view language as imitative, learned behavior. __20__ , children learn language from their parents by imitating them.Parents gradually shape their childs lang uage skills by positively reinforcing precise imitations and negatively reinforcing imprecise ones.

　　1.A.generated B.evolved C.born D.originated

　　2.A.valuable B.appropriate C.convenient D.favorite

　　3.A.attainments B.feasibility C.entertainments D.evolution

　　4.A.essential B.available C.reliable D.responsible

　　5.A.confirm B.inform C.claim D.convince

　　6.A.for B.from C.of D.with

　　7.A.organizations B.organisms C.humans D.children

　　8.A.potential B.performance C.preference D.passion

　　9.A.as B.just as C.like D.unlike

　　10.A.ideological B.biological C.social D.psychological

　　11.A.reviews B.reference C.reaction D.recommendation

　　12.A.In a word B.In a sense C.Indeed D.In other words

　　13.A.various B.different C.the higher D.the lower

　　14.A.revealed B.exposed C.engaged D.involved

　　15.A.regulations B.formations C.rules D.constitutions

　　16.A.Although B.Whether C.Since D.When

　　17.A.distinguished B.different C.protected D.isolated

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