单项选择题

Who are the two speakers

A．Teacher and student.
B．Husband and wife.
C．Clerk and customer.
D．Doctor and patient.
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单项选择题
It can be concluded from the passage that one should sleep as many hours as necessary to ______.
A．improve one’s memory dramatically
B．be considered dynamic by other people
C．maintain one’s daily schedule
D．feel energetic and perform adequately
单项选择题
It would be easier to memorize your PINs if you ______.
A．produce them in a casual manner
B．use numbers instead of letters
C．relate them to the real world
D．change them frequently
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