单项选择题

What can you find in such a book （）

A．Gene rush.
B．Human genome.
C．Human DN

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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
单项选择题
24（）

A．Once
B．Before
C．While
D．Until
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