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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 p

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 p

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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 children vary 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 also 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 enjoyments, 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"(Line 2, Para. 1)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C
解析 这是一道推理题。该句话句意为；小孩子能在如此短的时间内学会说话，这个事实需要人们加以解释。Challenge动词的使用表明这种解释不是容易的。C项正确。
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