单项选择题

The crow was finally deceived because__________.

A．it was not afraid of the men in the tower
B．it did not have a number sense
C．it could not distinguish between four and five
D．four men left the tower
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单项选择题
We can conclude from this passage that number sense in animals appears to be__________.
A．restricted to about one dozen species or less
B．akin to a faculty possessed by men in all stages of development
C．present chiefly in winged creatures
D．related directly to preservation or offspring
单项选择题
The author feels that the number sense displayed by a variety of wasp is__________.
A．more remarkable than that of a crow
B．less convincing an instance than that displayed by the crow because it seems to be instinctive
C．on a par with that of a crow
D．actually not an instance of what the author is discussing because it is tied to a regular pattern of responses
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