二、完型填空
　　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 21__________ , they were like newborn children, unable to use this 22 __________tool.Yet once language developed, the possibilities for human kind future 23__________ and cultural growth increased.
　　Many linguists believe that evolution is 24__________ for our ability to produce and use language.They 25 __________that our highly evolved brain provides us 26__________ an innate language ability not found in lower 27 __________. Proponents of this innateness theory say that our 28__________ for language is inborn, but that language itself develops gradually, 29__________ a function of the growth of the brain during childhood.Therefore there are critical 30__________ times for language development.
　　Current 31 __________of innateness theory are mixed, however, evidence supporting the existence of some innate abilities is undeniable. 32 __________, more and more schools are discovering that foreign languages are best taught in 33 __________grades.Young children often can learn several languages by being 34 __________to them, while adults have a much harder time learning another language once the 35 __________of their first language have become firmly fixed.
　　36 __________some aspects of language are undeniably innate, language does not develop automatically in a vacuum.Children who have been 37__________ from other human beings do not possess language.This demonstrates that 38__________ with other human beings isnecessary for proper language development.Some linguists believe that this is even more basic to human language 39 __________than any innate capacities.These theorists view language as imitative, learned behavior. 40__________ , 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.
　　21.请选择答案填入( )。
　　A.generated B.evolved C.born D.originated
　　【答案】B
　　22.请选择答案填入( )。
　　A.valuable B.appropriate C.convenient D.favorite
　　【答案】A
　　23.请选择答案填入( )。
　　A.attainments B.feasibilityC.entertainments D.evolution
　　【答案】A
　　24.请选择答案填入( )。
　　A.essential B.available C.reliable D.responsible
　　【答案】D
　　25.请选择答案填入( )。
　　A.confirm B.inform C.claim D.convince
　　【答案】C
　　26.请选择答案填入( )。
　　A.for B.from C.of D.with
　　【答案】D
　　27.请选择答案填入( )。
　　A.organizations B.organisms C.humans D.children
　　【答案】B
　　28.请选择答案填入( )。
　　A.potential B.performance C.preference D.passion
　　【答案】A
　　29.请选择答案填入( )。
　　A.as B.just as C.like D.unlike
　　【答案】A
　　30.请选择答案填入( )。
　　A.ideological B.biological C.social D.psychological
　　【答案】B

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