2. 外语
  3. Is language, like food, a basic human need without which a child at a critical period of life can be starved and damaged?【C1】___

Is language, like food, a basic human need without which a child at a critical period of life can be starved and damaged?【C1】___

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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?【C1】______ the drastic experiment of Frederick II in the thirteenth century, it may be. Hoping to discover【C2】______ language a child would speak if he heard no mother tongue, he told the nurses to keep【C3】______.
    All the infants died before the first years. But clearly there was more than【C4】______ language here. What was missing was good mothering. Without good mothering, in the first year of life especially, the【C5】______ to survive is seriously affected.
    Today no such severe lack exists as that ordered by Frederick.【C6】______, some children are still backward in speaking. Most often the【C7】______ for this is that the mother is insensitive to the【C8】______ of the infant, whose brain【C9】______ to learn language rapidly. If these sensitive periods are neglected, the ideal time for【C10】______ skills passes and they might never be learned so【C11】______ again. A bird learns to sing and to fly rapidly at the right time, but the process is slow and hard【C12】______ the critical stage has passed.
    Experts suggest that speech stages are reached in a fixed sequence and at a【C13】______ age, but there are cases【C14】______ speech has started late in a child who eventually【C15】______ to be of high IQ. At twelve weeks a baby smiles and makes vowel-like【C16】______; at twelve months he can【C17】______ simple words and understand simple commands; at eighteen months he has a【C18】______ of three to fifty words. At three he knows about 1,000 words which he can【C19】______ sentences, and at four his language differs from【C20】______ of his parents in style rather than grammar.
【C12】
选项 A、before
B、unless
C、until
D、once
答案D
解析 关联词题。once在此处并非表示“一次”，而是用作连词，意为“一旦”，连接but之后的内容，意为：一旦关键时期过去，学习过程就变得很漫长。故D正确。
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