[填空题]A considerable amount of medical research is aimed at identifying risk factors for disease. The rationale behind this work is that when people are informed of their risk, they will happily change their behavior to lower that risk. (51) this is certainly a reasonable assumption, it turns out that things are not quite that simple and straightforward. First of all, health is not necessarily a top priority in everyone’s life and, for these people, changing behavior in the interests of health may interfere (52) other, more important matters. Second, the benefits to be derived (53) such changes rarely are immediate or obvious. Usually, improvements in health take place over long periods of time and are quite subtle. (54) , we are all so bombarded with information about the thousands of health hazards to which we are exposed (55) most of us "time out" much of this information. This latter issue is compounded by the fact that much of new information

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