单项选择题

Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．Four years.
B．Five years.
C．Three years.
D．Six years.
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填空题
To write out the human genome on paper would require ______ books.
单项选择题
In the second paragraph, the word ratio refers to ______.
A．minimum input divided by maximum output
B．given input divided by maximum output
C．output divided by input
D．money divided by output
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