人工流产术后12日仍有较多量阴道流血,应首先考虑的为
A. 子宫穿孔
B. 子宫复旧不良
C. 吸宫不全
D. 子宫内膜炎
E. 子宫绒毛膜癌
最不可靠的避孕方法为
A. 阴茎套
B. 阴道套
C. 安全期避孕
D. 宫内节育器
E. 口服避孕药
My sister, ____(which/who) lives in Canada, is a dancer.
He’s a writer ____(whose/which) books have been translated into one hundred languages.