单项选择题


A．land
B．independence
C．benefit
D．advantage
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单项选择题
A．accordanceB．conflictC．agreementD．exchange
A．accordance
B．conflict
C．agreement
D．exchange
单项选择题
All of the following Were suggested as being used by sleep researchers EXCEPT ______.
A．electrodes
B．hypnosis
C．charts
D．recorders
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