李女士,36岁,有正常性生活,未采取避孕措施,婚后4年未孕,正确的诊断是()
A.人工授精
B.原发性不孕
C.继发性不孕
D.试管婴儿
E.诱发排卵
参考答案:B
已知⊙O1和⊙O2的直径分别为4cm和6cm,两圆的圆心距是1cm,则两圆的位置关系是( )
A.内切
B.外切
C.相交
D.外离
根据上下文补全对话
Jack: Hello! 1
Tom: Sure. Wait a minute.
Mary: Hello. 2
Jack: This is Jack speaking. Mary, my mother is ill. So I must stay at home to look after her.
Mary: 3 What can I do for you?
Jack: Would you like to tell Miss Gao that I can't go to school this afternoon?
Mary: 4
Jack: Thanks.
Mary: 5
1. 2. 3. 4. 5.