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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单项选择题
What is Mr. Mitchell particularly interested in
A．Oil products.
B．Dyestuffs and pigments.
C．Cotton and linen materials.
单项选择题
What kind of company is Sinochem
A．It is the largest company in China.
B．It specializes in imports and exports of chemical products.
C．It primarily sells dyestuff and pigments.
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