It is, everyone agrees, a huge task that the child performs when he learns to speak, and the fact that he does so in such 【M1】__

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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 such 【M1】______
short a period of time challenges explanation.
    Language learning begins with listening. Individual children
varying greatly in the amount of listening they do before they 【M2】______
start speaking, and late starters are often long listeners. Most
children will "obey" spoken instructions some time before
they can speak, but the word "obey" is hardly accurate as a 【M3】______
description of the eager and delight cooperation usually shown 【M4】
by the child. After they can speak, many children will ask 【M5】
questions by gestures and by making questioning noises.
    Any attempt to trace the development from the voices 【M6】______
babies make to their first spoken words leads to considerable
difficulties. What is agreed that they enjoy making noises, 【M7】______
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, either, that from about three 【M8】______
months they play with sounds for enjoyment and by six months 【M9】______
they are able to add new sounds to their repertoire.
    This self-imitation leads on to deliberate imitation of sounds
make or words spoken to them by other people. The problem 【M10】______
then arises as to the point at which one can say that their imitations can be considered as speech.
【M2】

选项

答案varying—vary

解析 观察发现主语为Individual children,varying是现在分词形式,不能充当谓语,句子前后的时态为一般现在时且句子主语为复数名词,故应将varying改为vary。
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