Scientists once thought thatMen are different from animals because ________. Scientists do not know ________.

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问题 Scientists once thought thatMen are different from animals because ________.
Scientists do not know ________.

选项 A、how children learn their own languages
B、When children begin to learn their own languages
C、Why children learn their own languages

答案A

解析 本题属于推断题。根据文章最后四句话可以推断,A所表述的是正确的。故本题答案为A。
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