2. 外语
  3. From the child to old age, we all use language as a means of【B1】______ our knowledge of ourselves and the world around us. When

From the child to old age, we all use language as a means of【B1】______ our knowledge of ourselves and the world around us. When

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问题       From the child to old age, we all use language as a means of【B1】______ our knowledge of ourselves and the world around us. When humans first【B2】______ , they were like newborn children, unable to use this valuable tool. Yet once language developed, the【B3】______ for human’s kind’s future attainment and cultural growth increased.
     Many linguists believe that evolution is【B4】______ for our ability to produce and use language. They 【B5】______ that our high evolved brain provides us with an innate language ability not found in lower organism. Proponents of this innateness theory say that our potential for language is【B6】______ , but that language itself develops【B7】______ , as a function of the growth of the brain during childhood. Therefore there are critical biological times for language development.
     Current reviews of innateness theory are mixed, however, evidence supporting the【B8】______ of some innate abilities is undeniable. Indeed, more and more schools are discovering that foreign languages are best taught in the lower grades.【B9】______ .
     Although 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.【B10】______ 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.【B11】______ .
【B1】
选项
答案broadening
解析 broaden“扩展”。由短语as a means of可知该处需填入动名词或名词，由our knowledge可推测填入动名词。
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