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Is language, like food, a basic human need without which a child at a critical period of life can be starved and damaged? Judgin

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问题     Is language, like food, a basic human need without which a child at a critical period of life can be starved and damaged? Judging from the drastic experiment of Frederic I in the thirteenth century, it may be. 【R1】______
    All the infants died before the first year. But clearly there was more than lack of language here.【R2】______Without good mothering, in the first year of life especially, the capacity to survive is seriously affected.
    Today no such severe lack exists as that ordered by Frederick.【R3】______Most often the reason for this is that the mother is insensitive to the signals of the infant, whose brain is programmed to learn language rapidly. If these sensitive periods are neglected, the ideal time for acquiring skills passes and they might never be learned so easily again. 【R4】______
    Experts suggest that speech stages are reached in a fixed sequence and at a constant age.【R5】______At twelve weeks a baby smiles and makes vowel-like sounds; at twelve months he can speak simple words and understand simple commands; at eighteen months he has a vocabulary of three to five words. 【R6】______
    Recent evidence suggests that an infant is born with the capacity to speak. What is special about man’s brain, compared with that of the monkey, is the complex system which enables a child to connect the sight and feel of, say, a toy-bear with the sound pattern "toy bear".【R7】______
    But speech has to be induced, and this depends on interaction between the mother and the child, where the mother recognizes the signals in the child’s babbling, grasping and smiling, and responds to them. Insensitivity of the mother to these signals dulls the interaction because the child gets discouraged and sends out only the obvious signals. 【R8】______
    A. What was missing was good mothering.
    B. A bird learns to sing and to fly at the right time, but the process is slow and hard once the critical stage has passed.
    C. Hoping to discover what language a child would speak if he heard no mother tongue, he told the nurses to keep silent.
    D. But there are cases where speech has started late in a child who eventually turns out to be of high IQ.
    E. And even more incredible is the young brain’s ability to pick out an order in language from the mixture of sound around him, to analyze, to combine and recombine the parts of a language in new ways.
    F. Sensitivity to the child’s non-verbal signals is essential to the growth and development of language.
    G. At three he knows about 1,000 words which he can put into sentences, and at four his language differs from that of his parents in style rather than grammar.
    H. Nevertheless, some children are still backward in speaking.
【R4】
选项
答案B
解析 在第4空格的前一句提到，如果错过了学习语言的最佳时期，再学就困难多了，句B提到，如果鸟儿错过了学习唱歌和飞翔的正确时间，再要掌握这些技能就很困难了，句B用鸟的例子进一步说明最佳学习时期的重要性，是对作者观点的进一步论证。
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