单项选择题

Which is most expensive

A．Black.
B．Brilliant Red K-2BP.
C．Brilliant Blue KNR.
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单项选择题
What are reactive dyes used for
A．Fine cottons, silk and linen.
B．Cottons, silk and jeans.
C．Silk, wool and linen.
单项选择题
What is the disadvantage of sulfur dye
A．It is expensive.
B．The colours available are limited.
C．It doesn’t have a long history.
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