题目
3D printing is just at the beginning stage. It is not ____.
A、mature
B、ripe
C、grown
第1题
Printing ______ greatly at the beginning of the 11th century.
A: will be developed
B: has been developed
C: is developed
D: was developed
第2题
Printing ______ greatly at the beginning of the 11th century.
A: has been developed
B: will be developed
C: was developed
D: is developed
第3题
— 3D printing is one of the latest technological innovations.
— ____ Maybe its functions are questionable.
A、Really?
B、Exactly.
C、I think so.
第4题
A.humble
B.modest
C.timid
D.middle
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