单项选择题

A．The structure of genes.
B．The transformation of medical care.
C．The completion of the human genetic map.
D．The diagnosis of diseases.
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单项选择题
A．Once a week.B．Twice a week.C．Once every three weeks.D．Once every two weeks.
A．Once a week.
B．Twice a week.
C．Once every three weeks.
D．Once every two weeks.
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.
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