单项选择题

In Hunter's experiment, the rat had to remember______.

A．where the food was
B．how to leave the cage
C．how big the cage was
D．which light was turned on
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How does the writer describe the feelings of someone who observes the approach of driver ants
A．Frightened.
B．Distressed.
C．Insecure.
D．Uneasy.
单项选择题
What creatures are best equipped to digest ants
A．Certain humans.
B．Anteaters.
C．Other ants.
D．Termites.
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