Question
One of the most ______ source of indoor air pollution is
the allergens. House dust mites (HDM) are very small insects not _______ to the naked eye and are the commonest source of allergy in the house. They are ubiquitous and _____ in a warm and moist atmosphere. They _____ very fast and are very difficult to eradicate. Modem houses present ample breeding spaces for them in the form of carpets, curtains, mattresses, pillows, etc. Select the most appropriate option to fill in the blanks.Solution
The correct answer is A
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