2. 专升本
  3. At present nanotechnology(纳米技术), a kind of tip science______to the common peopleFew people know him.

At present nanotechnology(纳米技术), a kind of tip science______to the common peopleFew people know him.

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问题 At present nanotechnology(纳米技术), a kind of tip science______to the common peopleFew people know him.
选项 A、unknowing
B、unknown
C、known
D、untrue
答案B
解析
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