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  3. It is, everyone agrees, a huge task that the child performs when he learns to speak, and the fact that he does so in so short a

It is, everyone agrees, a huge task that the child performs when he learns to speak, and the fact that he does so in so short a

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问题    It is, everyone agrees, a huge task that the child performs when he learns to speak, and the fact that he does so in so short a period of time challenges explanation.
   Language learning begins with listening. Individual chirden very greatly in the amount of listening they do before they start speaking, and late starters are often long listeners. Most children will "obey" spoken instructions some time before they can speak, though the word obey is hardly accurate as a description of the eager and delighted cooperation usually shown by the child. Before they can speak, many children will ask questions by gesture and by making questioning noises.
   Any attempt to trace the development from. the noises babies make to their first spoken words leads to considerable difficulties. It is agreed that they enjoy making noises, and that during the first few months one or two noises sort themselves out as particularly indicative of delight, distress, sociability, and so on. But since these cannot be said to show the baby’s intention to communicate, they can hardly be regarded as early forms of language.  It is agreed, too, that from about three months they play with sounds for enjoyment, and that by
six months they are able to add new sounds to their repertoire(能发出的全部声音). This self-imitation leads on to deliberate (有意识的)imitation of sounds made or words spoken to them by other people. The problem then arises as to the point at which one can say that these imitations can be considered as speech.
By"...... challenges explanation" (Para. 1, Line 2)the author means that______.
选项 A、no explanation is necessary for such an obvious phenomenon
B、no explanation has been made up to now
C、it’s no easy job to provide an adequate explanation
D、it’s high time that an explanation was provided
答案D
解析 challenge 通常有三种意思：(1)挑战；(2)要求，需要；(3)对……表示异议，怀疑，质问；依据文章第一段作者的意图，challenge 应是第二种意思；选择项[D]与之吻合。
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