From childhood to old age，we all use language as a means of broadening our knowledge of ourselves and the world about us.When humans first 1，they were like newborn children，unable to use this 2tool.Yet once language developed，the possibilities for human kinds future 3and cultural growth increased.

　　Many linguists believe that evolution is 4for our ability to produce and use language.They 5that our highly evolved brain provides us 6an innate language ability not found in lower 7.Proponents of this innateness theory say that our 8for language is inborn，but that language itself develops gradually，9 a function of the growth of the brain during childhood.Therefore there are critical 10times for language development.

　　Current 11of innateness theory are mixed，however，evidence supporting the existence of some innate abilities is undeniable.12，more and more schools are discovering that foreign languages are best taught in 13grades.Young children often can learn several languages by being 14to them，while adults have a much harder time learning another language once the 15of their first language have become firmly fixed.

　　16 some aspects of language are undeniably innate，language does not develop automatically in a vacuum.Children who have been 17from other human beings do not possess language.This demonstrates that 18with other human beings isnecessary for proper language development.Some linguists believe that this is even more basic to human language 19than any innate capacities.These theorists view language as imitative，learned behavior.20，children learn language from their parents by imitating them.Parents gradually shape their child’s language 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.feasibilityC.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.formationsC.rules D.constitutions

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

　　17.A.distinguished B.differentC.protected D.isolated

　　18.A.exposition B.comparison C.contrastD.interaction

　　19.A.acquisition B.appreciation C.requirementD.alternative

　　20.A.As a result B.After allC.In other words D.Above all

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