单项选择题

What are the scientist 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 sequence.
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单项选择题
In the passage, which of the following is NOT included in the advantages of advertising（）

A．Securing greater fame
B．Providing more jobs
C．Enhancing living standards
D．Reducing newspaper cost.
单项选择题
21（）

A．mood
B．sample
C．situation
D．environment
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