单项选择题

What is the main idea of Par

A．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
What does the author want to tell us in Par
A．4 to Para. 9A. New technology used in public transportation.B. The future trends in public transportation.C. The automation through new technology.D. Advanced transit concepts.
单项选择题
The first two paragraphs want to tell us______.
A．the public transportation problems since the World War II
B．private transit systems were replaced by local government
C．why in the 1964 Urban Mass Transportation Act established
D．how to solve the public transportation revenue
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