2. 外语
  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.
【M2】
选项
答案critic→critical
解析 形近词误用。联系上下文可知，该处意为“鸟类在适当的时候能快速学会鸣叫和飞翔，可一旦错过关键时期，这个学习过程就会缓慢而艰难”。critic是名词，意为“批评家；批评者”；critical是形容词，意为“关键的；至关紧要的”，该处是用来修饰名词stage，故应将critic改为critical。
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