A．Black. B．Brilliant Red K-2BP. C．Brilliant Blue KNR.
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.
