A high negative ion count is likely to be foundA．near a pond with a water pump.B．close to a slow-flowing river.C．high in some barren mountains.D．by a rotating water sprinkler.
A high negative ion count is likely to be found
A．near a pond with a water pump.
B．close to a slow-flowing river.
C．high in some barren mountains.
D．by a rotating water sprinkler.
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