Teenagers _____ their health because they play computer games too much. [ ]

A. have damaged

B. are damaging

C. damaged

D. will damage

在北京第28届奥运会上，中国体育代表团再创辉煌，以51金14银28铜的成绩历史性地在金牌榜上名列第一。结合材料回答：我国公民必须必须履行的维护国家利益的义务有哪些？我国奥运健儿为国争光的事迹体现了其中的哪一条？

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