确定早孕最可靠的辅助检查方法是（）
A.妊娠免疫试验
B.妇科内诊
C.B超检查
D. * * 脱落细胞学检查
E.测定尿中孕二醇值
参考答案：C
–I’m going to travel to America. Would you consider telling me about your experiences there?
---____. Let’s discuss it over dinner.
A．That’s all right.
B．By all means.
C．Go ahead.
D．It just depends.
尿路感染最常见的致病菌是（ ）。
