单项选择题

Electrical impulses affect ______.

A．long-term memory
B．short-term memory
C．structural changes
D．brain cells
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单项选择题
The experiments of two groups of rats indicate that ______.
A．temperature affects rats' memory
B．the relationship between temperature and memory is very clear
C．there is distinction between short-term memory and long-term memory
D．rats can relearn the task after forgetting it
单项选择题
What is the main idea of this passage
A．The difference between short-term memory and long-term memory.
B．The experiments of two groups of rats.
C．The temperature for rats to lose their memory.
D．The importance of memory.
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