20. What is the author's main purpose in the passage?
(A) To show how technology influenced basic science
(B) To describe the scientific base of nineteenth-century American industries
(C) To correct misunderstandings about the connections between science, technology, and industry
(D) To argue that basic science has no practical application

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統計： A(0), B(4), C(9), D(2), E(0) #803569