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外语
Carbon is a(n)______ while carbon dioxide is a compound.
Carbon is a(n)______ while carbon dioxide is a compound.
admin
2017-04-12
13
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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