2. 外语
  3. Scientists think the difference between animals and men is ______. Now, scientists still don’t really know ______.

Scientists think the difference between animals and men is ______. Now, scientists still don’t really know ______.

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问题 Scientists think the difference between animals and men is ______.
Now, scientists still don’t really know ______.
选项 A、whether animals can think about the past and the future
B、how children learn and what happens when we speak
C、at what age, a child can speak his language very well
D、what animal can understand some things more quickly than human beings
答案B
解析 本题询问科学家对于什么问题还不明确，根据原文(40)处可知，科学家对于孩子是怎样学习的，以及当我们说话时发生什么他们还是不明确，故选B。
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