单项选择题

The author wants to tell us in Para 1-4_____.

A．DNA's functions
B．DNA's applications
C．DNA's research
D．DNA's techniques
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单项选择题
According to the passage, it can be deduced that_____.
A．in the future DNA technology will dominate the industry and agriculture
B．in the future DNA technology will disappear from the world
C．in the future DNA technology will be a dilemma in a long time
D．in the future the human beings derived from the DNA technology will take over the earth
单项选择题
What does the author want to tell us in Para 4 to Para 9
A．New technology used in public transportation.
B．The future trends in public transportation.
C．The automation through new technology.
D．Advanced transit concepts
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