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123. At present nanotechnology(納米技術), a kind of tip science_________to the common people. Few people know him.

A. unknowing         B. unknown          C. known            D. Untrue

123. At present nanotechnology(納米技術), a kind of tip science_________to the common people. Few people know him.

A. unknowing         B. unknown          C. known            D. Untrue

123. At present nanotechnology(納米技術), a kind of tip science_________to the common people. Few people know him.

A. unknowing         B. unknown          C. known            D. Untrue

123. At present nanotechnology(納米技術), a kind of tip science_________to the common people. Few people know him.

A. unknowing         B. unknown          C. known            D. Untrue

123. At present nanotechnology(納米技術), a kind of tip science_________to the common people. Few people know him.

A. unknowing         B. unknown          C. known            D. Untrue