单项选择题

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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单项选择题

The crow was finally deceived because ______.

A．it was not afraid of her men in the tower
B．it did not have a number sense
C．it could not distinguish between four and five
D．it was evening and the crow was unable to count the hunters

单项选择题

The author feels that the number sense displayed by Genus Eumenus is ______.

A．more remarkable than that of a crow
B．less convincing an instance than that displayed by the crow
C．actually not an instance of what the author is discussing
D．restricted to the female of this species