31 What is the main topic of the passage?
(A) The history of social media
(B) The influence of short-video platforms on information consumption
(C) The development of artificial intelligence
(D) The advantages of traditional newspapers
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統計: A(0), B(1), C(0), D(0), E(0) #4002998
統計: A(0), B(1), C(0), D(0), E(0) #4002998