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题目详情：
Several recent studies have shown a link between health and stair usage. One recently completed study shows that people who live in stairs-only apartment buildings (that is, buildings without
elevators) live an average of three years longer than do people who live in buildings with both
elevators and stairs. A second study shows that elderly residents of buildings with elevators make, on average, twice as many visits to doctors each year as do residents of buildngs without
elevators. Furthermore, several doctor's offices are reporting that residents of stairs-only buildings
scored higher than average on questionnaires administered to new patients, in which the patients
were asked to rate several aspects of their own health (e.g., fitness, sleep quality, susceptibility to
injury, etc.). The clearest explanation for these findings is that the moderate daily exercise required
of residents who must use the stairs instead of elevators increases people's health and longevity.
Write a response in which you discuss one or more alternative explanations that could rival the proposed explanation and explain how your explanation(s) can plausibly account for the facts presented in the argument.
Write a response in which you discuss one or more alternative explanations that could rival the proposed explanation and explain how your explanation(s) can plausibly account for the facts presented in the argument.
以上解析由 考满分老师提供。
