单项选择题

Indigo is a vat color,______ called because it does not dissolve in water.

A．which it
B．it is
C．but
D．so
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单项选择题
______ plants, which manufacture their own food, animals obtain nourishment by acquiring and ingesting their food.
A．As
B．Different
C．Unlike
D．As many
单项选择题
I had to pay ______ on a carpet I brought in through the Customs today.
A．taxes
B．rates
C．fines
D．duty
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