单项选择题

Primary batteries or cells are _______ , once discharged, are discarded.

A．those
B．those that
C．that
D．that they
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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
单项选择题
The government asked the people to be sure to avoid _______ any water which had not been boiled.
A．drinking
B．to drink
C．having drink
D．not to be drunk
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