单项选择题

What are the scientists doing last in order to piece together the instruction book for human biology（）

A．They draw the genetic maps.
B．They grow pure human DNA.
C．They let a computer read its chemical sequenc

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单项选择题

A．Once
B．Before
C．While
D．Until

单项选择题

A．other
B．another
C．one
D．every

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