单项选择题

_______ is to arrange them in groups or sequences according to a plan.

A．Things classified
B．In classifying things
C．As classification of things
D．To classify things
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单项选择题
Primary batteries or cells are _______ , once discharged, are discarded.
A．those
B．those that
C．that
D．that they
单项选择题
The Rocky Mountain goat of North America is not a tree goat _______ a goat antelope.
A．and
B．but
C．any
D．yet
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