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非常棒的同意替换！

Today no such severe lack exists as that ordered by Frederick. Nevertheless, some children are still backward in speaking. Most often the reason for this is that the mother is insensitive to the signals of the infant, whose brain 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 critical stage has passed.

1. The reason some children are backward in speaking is most probably that ________.

[A] they are incapable of learning language rapidly

[B] they are exposed to too much language at once

[C] their mothers respond inadequately to their attempts to speak

[D] their mothers are not intelligent enough to help them

昨天句子的解析：

Social science is that branch of intellectual enquiry/ which seeks to study humans and their endeavors/ in the same reasoned, orderly, systematic, and dispassioned manner/ that natural scientists use for the study of natural phenomena.

词汇突破:

1.intellectual enquiry 知识探究 

2.humans and their endeavors 人类及其行为 

3.reasoned 理性的 

4.orderly 有序的 

5.systematic 系统的 =organized 

6.dispassioned 冷静的 

确定主干：Social science is that branch of intellectual enquiry

          （That 在这里是为了增加语言的正式性；）

社会科学是知识探索的一个分支

其他成分：1. which seeks to study humans and their endeavors 定语从句

            这个学科尝试着研究人类及其行为

2. in the same reasoned, orderly, systematic, and dispassioned manner 

用理性的、有序的、系统的和冷静的方式

3. that natural scientists use for the study of natural phenomena.

  像自然科学家研究自然现象那样

  定语从句

注意独立成句，调整语序！

参考译文：社会科学是知识探索的一个分支，它力图像自然科学家研究自然现象那样，用理性的、有序的系统的和冷静的方式研究人类及其行为。