Carbon is a(n)______ while carbon dioxide is a compound.A、materialB、substanceC

游客2025-04-03  0

问题 Carbon is a(n)______ while carbon dioxide is a compound.

选项 A、material
B、substance
C、agent
D、element

答案 D

解析 element n.(化学)元素;成分,要素material n.材料,原料;素材,资料。substance n.物质;实质;要旨,基本内容;根据,理由。agent n.代理人,代理商;(化学)剂。
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