48. According to the passage, how many cells of skin does the human body rid itself of every day?
(A) 60 trillion
(B) 50 million
(C) 1 million
(D) Between 31 and 50
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統計: A(1), B(10), C(1), D(0), E(0) #802986
統計: A(1), B(10), C(1), D(0), E(0) #802986