单项选择题

A．Teacher and student.
B．Lawyer and client.
C．Doctor and patient.
D．Police and witness.
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单项选择题
The theory of the origin of the universe is just ______ and lacks proof.
A．spontaneous
B．hypothetical
C．intuitive
D．empirical
单项选择题
Military orders are ______ and cannot be disobeyed.
A．defective
B．conservative
C．alternative
D．imperative
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