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【简答题】
The argument that humans, even in prehistoric times, had some number sense, at least to the extent of recognizing the concepts of more and less when some objects were added to or taken away from a small group, seems fair, for studies have shown that some animal possess such a sense.
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【简答题】adj.偶然的,非正式的,临时的,不定期的,漠不关心的,冷漠的_____
【简答题】汉民族共同语的产生可以追溯到上古的( )时期。
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