From childhood to old age, we all use language as a means ofbroadening our knowledge of ourselves and the world aboutus.When humans first 1 , they were like newborn children,unable to use this 2 tool.Yet once language developed, thepossibilities for human kind‘s future 3 and cultural growthincreased.
　　Many linguists believe that evolution is 4 for our ability toproduce and use language.They 5 that our highly evolved brain provides us 6 an innate languageability not found in lower 7 . Proponents of this innateness theory say that our 8 for language isinborn, but that language itself develops gradually, 9 a function of the growth of the brain duringchildhood.Therefore there are critical 10 times for language development.
　　Current 11 of innateness theory are mixed, however, evidence supporting the existence ofsome innate abilities is undeniable. 12 , more and more schools are discovering that foreignlanguages are best taught in 13 grades.Young children often can learn several languages by being14 to them, while adults have a much harder time learning another language once the 15 of theirfirst language have become firmly fixed.
　　16 some aspects of language are undeniably innate, language does not develop automatically ina vacuum.Children who have been 17 from other human beings do not possess language.Thisdemonstrates that 18 with other human beings isnecessary for proper languagedevelopment.Some linguists believe that this is even more basic to human language 19 than anyinnate capacities.These theorists view language as imitative, learned behavior. 20 , children learnlanguage 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.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
　　18.A.exposition B.comparison C.contrast D.interaction
　　19.A.acquisition B.appreciation C.requirement D.alternative
　　20.A.As a result B.After all C.In other words D.Above all

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