正确答案: C

水

题目：从物质的分类的角度看，下列物质与二氧化氮、三氧化硫、氧化铝属于同类别的物质

解析：C

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学习资料的答案和解析：

[单选题]A

Her name is Mary． She comes from America． She is in China with her father and mother． She can speak a little Chinese． She studies in No． 80 Middle School in Tianjin．She is in the same school as her parents(father and mother)． She is a good student． She goes to school six days a week． She likes getting up early． She doesn’t like to be late．She often goes to school very early． But today she gets up late． So she gets to the classroom at 7：30． But there aren’t any students in it． She is not late． She is still early． It’s Sunday today． The students are all at home． ( )21．Mary is from _______．

merica

解析：21.A【解析】根据原文“She comes frorh America．” 可知，她是美国人。