There was a nice little gift for everyone, with a suitable poem _____ to it.

A．attached

B．to be attaching

C．to attach

D．attaching

胎盘的组成是（）

A.平滑绒毛膜、包蜕膜、羊膜

B.叶状绒毛膜、底蜕膜、羊膜

C.叶状绒毛膜、包蜕膜、羊膜

D.叶状绒毛膜、包蜕膜、底蜕膜

E.平滑绒毛膜、底蜕膜、羊膜