单项选择题

According to the passage the primary function of allelomimetic behavior in bird is to ______.

A．defend nests against predators
B．look at each other
C．locate prey
D．warn against predators
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单项选择题
The author implies that allelomimetic behavior occurs most often among animals that ______.
A．prey on other animals
B．are less intelligent than their enemies
C．move in groups
D．have one sense organ that dominates perception
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