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 kind’s future 【C3】______  and cultural growth increased.
   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. Therefore 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.
【C4】______

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

答案D

解析 此处意思是: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……的缘由”。其他选项不与for搭配。故选D项。
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