In May 2017， on the first BRF for international cooperation， President Xi sai

D.We should strengthen cooperation in frontier areas， such as digital economy and so on， linking them into the（）.

A.digital Silk Road of the 21st century

B.Silk Road Fiber Optic Cable

C.Online Silk Road

D.big data Silk Road

正确答案：digital Silk Road of the 21st century