在熊彼特的基础上，学术界对创新理论开展了进一步的研究，使创新

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在熊彼特的基础上，学术界对创新理论开展了进一步的研究，使创新理论日益精致和专门化，仅仅创新模型就先后出现了许多种，构建起（）等理论体系。

A.社会创新

B.技术创新

C.机制创新

D.创新双螺旋

答案

参考答案：B, C, D

选择题

The furniture is ____ of wood. [ ]

A. made

B. make

C. making

D. to make

选择题

—Did you see who killed the little girl?

—No, so quickly ___ that I couldn’t get a good look at his face.

A. did the car speed by

B. the car speed by

C. does the car speed by

D. the car speeds by