______ that the formation of the sun, the planets, and other stars began with the condensation of an interstellar gas cloud.

A．It is believed

B．To believe

C．To be believed

D．Believed

带下脾虚证的病机是（）

A.脾虚失运，痰浊内生

B.脾胃虚弱，胃失和降

C.脾失健运，水湿泛滥

D.脾虚下陷，统摄无权

E.脾虚湿盛，流注下焦