单项选择题

What’s the probable relationship between the two speakers

A．Teacher and student.
B．Mother and son.
C．Clerk and caller.
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单项选择题
Which of the following sentences is true of tile tasks which volunteers are required to do
A．They learned to navigate a car and then searched for an object.
B．They learned how to navigate and then searched the town for an object.
C．They learned to predict when a sequence of dots would appear on a screen.
D．They learned to predict how a sequence of dots would appear on a screen.
单项选择题
From the passage, we know that ______.
A．the brain begins processing and storing memories just before it's time for bed
B．parts of the brain that we have not used to learn become active again during sleep
C．the processing continues only when they're thinking about or doing other things.
D．each task requires different parts of the brain to learn.
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