He stopped playing soccer _____ his sore back.[ ]
A. because of
B. because
C. though
答案:A
多数认为诊断用超声在多少声功率时对人体无损害
A.0.1W/cm2以下B.0.1W/cm2以上C.0.2W/cm2以下D.0.2W/cm2以上E.0.3W/cm2以下
跆拳道的产生,结束了哪个国家唐手、空手道以及朝鲜古典武道等名称的混杂局面?