单项选择题

Henning tested the students' memory of______.

A．words copied several times
B．words explained
C．words heard
D．words seen
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单项选择题
Hunter found that rats______.
A．can remember only where their food is
B．cannot learn to go to the correct door
C．have a short-term memory of one-sixth a minute
D．have no short-term memory
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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