单项选择题

A．Teacher and student.
B．Husband and wife.
C．Classmate and classmate.
D．Boss and secretary.
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单项选择题
A．One.B．Two.C．Three.D．Sour.
A．One.
B．Two.
C．Three.
D．Sour.
单项选择题
A．The causes are obvious.B．The causes are very complicated.C．The causes are familiar.D．The causes are not well understood.
A．The causes are obvious.
B．The causes are very complicated.
C．The causes are familiar.
D．The causes are not well understood.
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