I am a fan of Liu Qian. _____ his magic ________ his humor attracts me.

A．Both… and

B．Either…or

C．Neither…nor

D．Not only… but also

包绕羊水的薄膜称为（）

A.胚外体腔

B.卵黄囊

C.羊膜囊

D.平滑绒毛膜

E.包蜕膜