The entry of air (a)
the house is ventilation. Air may
enter the house in many ways: natural ventilation when we open (b)
doors or windows or (c).
infiltration
through the cracks in the walls, floors or ceilings or (d)
exhaust fans or air conditioners: These pollutants (e)
dry throat and cough. One may forget that indoor air pollution can be the
cause
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Answer:
a) the house is ventilation Air May enter the house in many ways natural ventilation when we open
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