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  3. Some children are backward in speaking. ’Most often the Reason for this is because the mother is insensitive to the signals

Some children are backward in speaking. ’Most often the Reason for this is because the mother is insensitive to the signals

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问题     Some children are backward in speaking. ’Most often the
Reason for this is because the mother is insensitive to the signals        【S1】______
Of the infant,  whose brain is programmed to learn language
rapidly. If these sensitive periods are ignored, the ideal time for        【S2】______
acquiring skills passes and he might never be learned so easily            【S3】______
again. Experts suggest that speech stages be reached in a fixed            【S4】______
sequence and at a constant age, but there are cases where speech
has started late in a child who eventually turns to be of high IQ.         【S5】______
At twelve weeks a baby smiles and makes vowel-like sound; at
twelve months has a vocabulary of three to fifty words. At three
he knows about 1,000 words which he can put into sentences, and
at four his language differs from those of his parents in style rather     【S6】______
than grammar. A recent evidence suggests that an infant is born            【S7】______
with the capacity to speak.
    Therefore, speech has to be induced, and this depends on
inter-Action between the mother and the child,  whether the                【S8】______
mother Recognizes the signals in the child’s babbling, grasping
and Smiling, and responds them.  Insensitivity of the mother to
These signals dulls the interaction because the child gets                 【S9】______
discouraged and sent out only the obvious signals, Insensitivity to the
child’s non-verbal signals is essential to the growth and                  【S10】______
development of language.
【S4】
选项
答案be→are
解析 引出的suggest意为“暗示”，后面不用虚拟语气。
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