請依下文回答第 16 題至第 20 題: We all think we understand the formula for keeping healthy-- eat right, exercise, don’t smoke, skip dessert. But thatpicture is vastly incomplete, perhaps fatally so. While our individual health is highly dependent on our daily behaviors,it may be even more strongly influenced by the social and environmental conditions in which we live. Smith, a prestigiousdoctor, argues that the future of our health, and our healthcare system, depends on growing and supporting a newgeneration of healthcare practitioners who look upriver at the source of our health problems, rather than simply optingfor quick-hit symptomatic relief. These “Upstreamists,” as he calls them, are practitioners on the frontlines of health whosee that health (like sickness) is more than a chemical equation that can be balanced with pills and proceduresadministered within clinic walls. They see, rather, that health begins in our everyday lives, in the places where we live,work, eat and play. Upstreamists — who may be doctors, nurses or other clinicians — know that asthma can start in theair around us, or from the mold in the walls of our homes. They understand that obesity, diabetes and heart disease partlyoriginate in our busy modern schedules, in the unhealthy food choices available in our stores and even in the way ourneighborhoods are designed. They believe that depression, anxiety and high blood pressure can arise from chronicallystressful conditions at work and home. And, just as important, these caregivers understand how to translate thisknowledge into meaningful action.
【題組】16 What is the main idea in this passage?
(A) We should tackle sickness at its source.
(B) There are some serious problems in our national healthcare system.
(C) Sickness is mostly caused by our jobs.
(D)All modern diseases result from our busy schedules