阿摩線上測驗
48 What is this passage mainly about?
(A) 3D printing can easily produce designer products.
(B) The benefits, history, and future prospects of 3D printing.
(C) How 3D printing will overturn traditional economics of production.
(D) How materials such as ceramics and metals can be used to 3D print objects.
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統計： A(65), B(645), C(162), D(54), E(0) #1269189
統計： A(65), B(645), C(162), D(54), E(0) #1269189
