My family always have a party ______ the evening of October 1, and the party starts ______ 8. 00 p. m.

A．at; in

B．in; on

C．at; on

D．on; at

下列子宫发育异常中，超声无法显示的是（）。

A.先天性无子宫

B.幼稚子宫

C.双子宫

D.双角子宫

E.纵隔子宫