问题
选择题
they are twins, they don't look like the same at all. [ ]
A. Because
B. Though
C. As
D. Since
答案
答案：B
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they are twins, they don't look like the same at all. [ ]
A. Because
B. Though
C. As
D. Since
答案：B
CO＋H2，CO和H2的混合气体是合成多种有机物的原料气，研究由CO、H2合成有机物的化学称为一碳化学。下图是合成某些物质的路线图：