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 |
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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 |
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