题目内容

While a doctor treats people who are sick, those of people working in public health try to _________ people from getting sick or injured in the first place.

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Public health can mean vaccinating children and adults to prevent the spread of _________.

Public health works to track disease outbreaks, prevent injuries and shed light on why some of us are more likely to suffer from _______ health than others.

Themanyfacetsofpublichealthincludespeakingoutforlawsthatpromotesmoke-freeindoorairandseatbelts,spreadingthewordaboutwaystostayhealthyandgivingscience-based __________ toproblems.

Noxious agents can be introduced into the environment through farming, fertilizers, inadequate sewage disposal and drainage, construction, defective heating and ventilating systems, machinery, and _______________.