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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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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 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.
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