56. How does the author conclude the passage in the last paragraph?
(A) By calling for some sort of action.
(B) By giving advice to the general public.
(C) By predicting future development.
(D) By summarizing the main points.
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統計: A(1), B(2), C(6), D(18), E(0) #2722314
統計: A(1), B(2), C(6), D(18), E(0) #2722314