单项选择题

Which demands expertise least when it is produced

A．Red.
B．Blue.
C．Black.
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单项选择题
Which is most expensive
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.
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