[单项选择]Most people are aware that outdoor air pollution can damage their health, but many do not know that indoor air pollution can also (67) health significantly. Environmental Protection Agency studies (68) that indoor levels of pollutants may be 2-5 times, and (69) more than 100 times, higher than outdoor levels.
There are many sources of indoor air pollution in any (70) . These include combustion (燃烧) sources, products for home cleaning and (71) , personal care, or hobbies; central heating and cooling systems and humidification (72) ; and outdoor air pollution.
(73) effects may show up after a single exposure or (74) exposures. These include irritation of the eyes, nose, and throat, headaches, dizziness, and (75) . Such effects are usually short-term and (76) . Sometimes the treatment is simply (77) the person’s exposure to the source of the pollution, (7
A. eliminating
B. regulating
C. isolating
D. stimulating

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[单项选择]Most people are aware that outdoor air pollution can damage their health, but many do not know that indoor air pollution can also (67) health significantly. Environmental Protection Agency studies (68) that indoor levels of pollutants may be 2-5 times, and (69) more than 100 times, higher than outdoor levels.
There are many sources of indoor air pollution in any (70) . These include combustion (燃烧) sources, products for home cleaning and (71) , personal care, or hobbies; central heating and cooling systems and humidification (72) ; and outdoor air pollution.
(73) effects may show up after a single exposure or (74) exposures. These include irritation of the eyes, nose, and throat, headaches, dizziness, and (75) . Such effects are usually short-term and (76) . Sometimes the treatment is simply (77) the person’s exposure to the source of the pollution, (7
A. lessen
B. decline
C. effect
D. affect

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