题目
第1题
3D printing is just at the beginning stage. It is not ____.
A、mature
B、ripe
C、grown
第2题
— 3D printing is one of the latest technological innovations.
— ____ Maybe its functions are questionable.
A、Really?
B、Exactly.
C、I think so.
第9题
A.One dimensional
B.Two dimensional
C.Three dimensional
D.None of above
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