Many linguists believe that evolution is __4 __ for our ability to produce and use languages. They _ 5__ that our highly evolved brain provides us 6 an innate language ability not found in lower 7 . Proponents of this innateness theory say that our 8 for language is inborn, but that language itself develops gradually, _ 9 a function of the growth of the brain during childhood. Therefore there are critical ___10___ times for language development.

　　Current __11__ of 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 __13__ grades. Young children often can learn several languages by being __14__ to them, while adults have a much harder time learning another language once the __15__ of 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 __17__ from other human beings do not possess languages. This demonstrates that __18__ with other human beings is necessary for proper language development. Some linguists believe that this is even more basic to human language __19__ than 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 childrens 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. attainment B. feasibility C. entertainment 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. from

　　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. 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

　　Many linguists believe that evolution is __4 __ for our ability to produce and use languages. They _ 5__ that our highly evolved brain provides us 6 an innate language ability not found in lower 7 . Proponents of this innateness theory say that our 8 for language is inborn, but that language itself develops gradually, _ 9 a function of the growth of the brain during childhood. Therefore there are critical ___10___ times for language development.

　　Current __11__ of 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 __13__ grades. Young children often can learn several languages by being __14__ to them, while adults have a much harder time learning another language once the __15__ of 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 __17__ from other human beings do not possess languages. This demonstrates that __18__ with other human beings is necessary for proper language development. Some linguists believe that this is even more basic to human language __19__ than 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 childrens 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. attainment B. feasibility C. entertainment 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. from

　　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. 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