【单选题】The main idea of this passage is that ______.
A．man's elementary number sense is found in lower species
B．birds have a limited number sense
C．animals cannot count
D．number sense is a primitive form of counting
【单选题】The main idea of this passage is that ______.
A．man's elementary number sense is found in lower species
B．birds have a limited number sense
C．animals cannot count
D．number sense is a primitive form of counting
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