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 babys 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. This self-imitation leads on to deliberateimitation 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.
61. By challenges explanation the author means that ________.
A) no explanation is necessary for such an obvious phenomenon
B) no explanation has been made up to now
C) its no easy job to provide an adequate explanation
D) its high time that an explanation was provided
62. The third paragraph is mainly about ______.
A) the development of babies early forms of language
B) the difficulties of babies in learning to speak
C) babies strong desire to communicate
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