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.
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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.
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