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.
单项选择题What is Mr. Mitchell particularly interested in（）
A．Oil products. B．Dyestuffs and pigments. C．Cotton and linen materials.
