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
If rats are cooled to 5℃ for 15 minutes immediately, what will happen after being allowed to return to their normal temperature
A．They have no difficult in crossing the same maze.
B．They lose their way in the maze.
C．They can remember the way correctly.
D．They go through the maze after several trying.
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