单选题 The advocates—mainly family therapy doctors—are applying a new approach to everything from marriage conflict to psychosis.
A. margin B. marine C. marital D. martial

【正确答案】 C
【答案解析】[解析] marriage结婚,婚姻,婚姻生活(是名词);而A.margin页边的空白,(湖、池等的)边缘,(时间、金额等的)富余;B.marine舰队,海运业;海(产、运)的;C.marital婚姻的;D.martial战争的,军事的;因此C为答案。