Why did the potters discussed in the passage change the kind of pottery they made? How did yellow ware achieve its distinctive

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问题 Why did the potters discussed in the passage change the kind of pottery they made?
How did yellow ware achieve its distinctive color?

选项 A、By sponging on a glaze
B、By dusting on metallic powders
C、By brown-glazing
D、By firing at a high temperature