8. A healthy indoor environment is one that is provided with adequate ventilation and is free of toxins and pollutants.
(A) overloaded with
(B) attributed to
(C) restricted to
(D) unaffected by
(E) composed of .
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統計: A(0), B(13), C(55), D(235), E(15) #1950060
統計: A(0), B(13), C(55), D(235), E(15) #1950060