【正确答案】Despite the increasing importance of health, most people don't(fail to) become aware of(realize/recognize)the value of health until they fall ill. There is no doubt that moderate exercise can benefit health(be of health benefit). However, sports fans are faced with the lack of ideal places for exercise. Unlike forests, parks on either side of a busy street are prone(vulnerable/susceptible) tO atmospheric poHution, where exercise cannot enhance immunity, but instead is likely to induce various chronic diseases/exercise may induce various chronic diseases rather than enhance immunity．