2. 外语
  3. Ammonia, one of the earliest known nitrogen compounds, was originally produced by dis-tilling organic materials.

Ammonia, one of the earliest known nitrogen compounds, was originally produced by dis-tilling organic materials.

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问题 Ammonia, one of the earliest known nitrogen compounds, was originally produced by dis-tilling organic materials.
选项 A、masses
B、fabrics
C、substances
D、liquids
答案C
解析 物质
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