问题
选择题
123. At present nanotechnology(纳米技术), a kind of tip science_________to the common people. Few people know him.
A．unknowing
B．unknown
C．known
D．Untrue
答案
答案：B
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123. At present nanotechnology(纳米技术), a kind of tip science_________to the common people. Few people know him.
A．unknowing
B．unknown
C．known
D．Untrue
答案：B