下列物质中属于纯净物的是 [ ]

A. 食用醋

B. 冰水

C. 冰红茶

D. 加碘盐

短文改错。

Christine was just a girl in one of my classes.I never knew much about

her except for that she was strange.She didn't talk  many.Her hair was black

and purple, and she worn black sports shoes and a black sweater, although in the

 summer.She was, in fact, rather attractively, and she never seemed care what

the rest of us thought about her. Like the rest of my classmate, I didn't really

want to get closed to her.It was only when we did their chemistry project

together that  I begin  to  understand why Christine dressed the way  she  did.

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