单项选择题

What is the main idea of Para 5-7(last three paragraphs)

A．DNA's future tendencies.
B．DNA's controversy.
C．DNA's potentials.
D．DNA's social issues.
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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
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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