The classical Chinese folk music ________ a wave of homesickness among the overseas students. A. set out B. set off C. set about D. set on 答案:B癌症是严重威胁人类健康的疾病之一,下列有关描述正确的是
[ ]A.长期接触癌症患者的人细胞癌变几率增加B.癌症是致癌因子引发的,患病几率与年龄无关C.亚硝酸盐可通过改变基因的结构而致癌D.艾滋病患者与正常人患癌症的几率相同