From childhood to old age, we all use language as a 【C1】 ________ （mean）o

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问题       From childhood to old age, we all use language as a 【C1】 ________ （mean）of broadening our knowledge of ourselves and the world about us.When humans first evolved, they were like newborn children, unable to use this 【C2】________（value）tool.Yet once language developed, the possibilities for humankind’ s future feasibility and cultural growth increased.
   Many linguists believe that evolution is responsible for our ability to produce and use language.They claims that our highly evolved brain provides us 【C3】________ an innate language ability not found in lower organisms.Proponents of this innateness theory say that our potential for language is inborn, but that language itself develops 【C4】 gra________, as a function of the growth of the brain during childhood.Therefore there are critical biological limes for language development.Current reviews of 【C5】________ theory are 【C6】________ （mix）, however, evidence【C7】sup________ the existence of some innate abilities is【C8】________ （deny）.Indeed, more and more schools are discovering that foreign languages are best taught in 【C9】________ grades.Young children often can learn several languages by being exposed to them, while adults have a much harder time learning another language once the rules of their first language have become firmly fixed.
   【C10】Al________ some aspects of language are undeniably innate, language does not develop automatically in a vacuum.Children who have been isolated from other human beings do not possess language.This demonstrates that interaction with other human beings is necessary for proper language development.Some linguists believe that this is even more basic to human language acquisition than any innate capacities.These theorists view language as imitative, learned behavior.In other words, 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. [br] 【C2】

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答案 valuable

解析句意:当人类刚刚开始进化，他们如同新生儿一样不会运用（语言）这一珍贵的工具。形容词修饰名词。因此空缺处填入valuable,意为“珍贵的”。

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