31. What is the main idea of this passage?
(A) Los Angeles' diverse economic sectors
(B) How World War I! led to a boom in Los Angeles' manufacturing economy
(C) How Los Angeles became famous for its entertainanent industry
(D) Why shipbuilding was important for the US in World War II
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統計: A(15), B(37), C(5), D(3), E(0) #3056756
統計: A(15), B(37), C(5), D(3), E(0) #3056756