From childhood to old age, we all use language as a means of broadening our knowledge of ourselves and the world about us. When

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问题      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 【C1】______ , they were like newborn children, unable to use this 【C2】______  tool. Yet once language developed, the possibilities for human kinds future 【C3】______ and cultural growth in- creased.
   Many linguists believe that evolution is 【C4】______  for our ability to produce and use language. They 【C5】______ that our highly evolved brain provides us 【C6】______ an innate language ability not found in lower 【C7】______ . Proponents of this innateness theory say that our 【C8】______ for language is inborn, but that language itself develops gradually, 【C9】______ a function of the growth of the brain during childhood. There- fore there are critical 【C10】______ times for language development.
     Current 【C11】______ of innateness theory are mixed, however, evidence supporting the existence of some innate abilities is undeniable. 【C12】______ . more and more schools are discovering that foreign languages are best taught in 【C13】______ grades. Young children often can learn several languages by being 【C14】______ to them, while adults have a much harder time learning another language once the 【C15】______  of their first language have become firmly fixed.
    【C16】______ some aspects of language are undeniably innate, language does not develop automatically in a vacuum. Children who have been 【C17】______  from other human beings do not possess language. This demonstrates that 【C18】______ with other human beings is necessary for proper language development. Some linguists believe that this is even more basic to human language 【C19】______ than any innate capacities. These theorists view language as imitative, learned behavior. 【C20】______ , 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.
【C4】

选项 A、essential
B、available
C、reliable
D、responsible

答案D

解析 此处意为许多语言学家认为进化使人们产生和具备了语言的能力。固定短语be responsible for对……负责,是……的原由。其它选项不与for搭配。
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