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
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
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