Water is ____ hydrogen and oxygen.（　　）A．

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问题 Water is ____ hydrogen and oxygen.（　　）A． made upB． made up ofC． made byD． making by

选项 A． made up
B． made up of
C． made by
D． making by

答案 B

解析本题考查make的词组。make up的意思是“化妆、捏造”；make up of的意思是“构成、组成”；made by的意思是“由……制造”，用于被动语态。因此，本题应该选B，句意为“水是由氢元素和氧元素组成的”。

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