48. How does the author conclude the passage in the last paragraph?
(A) By adding new details.
(B) By predicting future development.
(C) By summarizing the main points.
(D) By giving advice to the general public.
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統計: A(37), B(36), C(249), D(20), E(0) #2160302
統計: A(37), B(36), C(249), D(20), E(0) #2160302