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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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
单项选择题
As an amateur, you'll have to ______ first.
A．follow the instructions in magazines
B．get the right tools
C．prepare fully psychologically
D．ask a skilled craftsman's advice
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