单项选择题

A．Once a week.
B．Twice a week.
C．Once every three weeks.
D．Once every two weeks.
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单项选择题
A．Husband and wife.B．Boss and secretary.C．Friends.D．Neighbors.
A．Husband and wife.
B．Boss and secretary.
C．Friends.
D．Neighbors.
单项选择题
A．Environment.B．Genes.C．Parents.D．Both A and B
A．Environment.
B．Genes.
C．Parents.
D．Both A and B
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