阅读下面短文，从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。
Poor indoor air quality can have health consequences that range from disease of the eyes, nose and throat to headaches and dizziness. It's also linked to respiratory (呼吸的) and heart disease. .
●Maximize fresh air
Katherine Pruitt, National Senior Director for Policy at the American Lung Association, offers three basic steps you can take to make your air better at home. . She says, "Let fresh air from outside in." This means that opening up your windows is often the simplest way to disperse anything bad that may be accumulating inside. If you have a central air conditioner, running it can be a good way to bring in outside air.
It may make sense to use a fan to improve indoor air quality. For instance, you might place one near an open window to help exhaust indoor air to the outdoors.
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The second thing you can do is called source control, which is keeping sources of pollutants out of the indoor environment if you can, says Pruitt.
It can be as simple, Pruitt says, as leaving your dry cleaning outside long enough to air the harmful chemicals out.
Cleaning your home is helpful. But Pruitt warns that"."She advises, "Read the labels and select safer products when you can."
·Purify the air
Finally, if necessary, the third thing you can try to improve your air is purification. For instance, if you want to remove airborne particles like smoke, dust and germs, ."For homes with air conditioners," says Pruitt, "you have a purifier that you're supposed to be changing regularly."
A. Prevent the air pollution
B. Control the source of the pollutants
C. you should focus on the air quality
D. The first has to do, with ventilation (通风)
E. Here's how to keep your home's air clean
F. it may make sense to use an indoor air purifier
G. Use of harsh cleaning supplies can introduce its own risks