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  3. Some children are backward in speaking. Most often the reason for this is that the mother is insensible to the signals of the i

Some children are backward in speaking. Most often the reason for this is that the mother is insensible to the signals of the i

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问题 Some children are backward in speaking. Most often the reason for
this is that the mother is insensible to the signals of the infant, whose brain【M1】________
is programmed to learn language rapidly. If these sensitive periods are
neglected, the ideal time for acquiring skills passes and they might never
be learned so easily again. A bird learns to sing and to fly rapidly at the
right time,  but the process is slow and hard once the critic stage has 【M2】________
passed.
Experts suggest that speech stages are reached at a fixed sequence and 【M3】________
at a constant age, but there are cases that speech has started late in a child 【M4】________
who eventually turns out to be high IQ.                            【M5】________
Recent evidence suggests that an infant is born with a capacity to      【M6】________
speak.  What is special about man’s brain,  compared with this of the 【M7】________
monkey, is the complex system which enables a child to connect the sight
and feel of, say, a toy-bear with the sound pattern "toy-bear. " And even
more incredible is that the young brain’s ability to pick out an order in 【M8】________
language from the hubbub of sound around him, to analyze, to combine
and recombine the parts of a language in new ways.
But speech has to be induced, and this depends on interaction
between the mother and the child, where the mother recognizes the signals
in the child’s babbling, grasping and smiling, and responding to them. 【M9】________
Insensitivity of the mother to these signals dull the interaction because the【M10】________
child gets discouraged and sends out only the obvious signals.
【M7】
选项
答案this→that
解析 代词误用。分析句子结构可知，此处的代词用于指代上文提到的brain。指示代词that指代上文已提到的事物，而this指代下文将要提到的事物，故应将this改为that。
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