49. Look at the terms “temper”(line9), “glazes”(line14), “kilns”(line23), and “compounds”(24). Which of these terms is NOT defined in the passage?
(A) temper
(B) glazes
(C) kilns
(D) compounds

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統計： A(1), B(1), C(0), D(0), E(0) #802321