When he came back three hours later, they were still ____on the sofa, _____ in conversation.

A．sitting ; absorbing

B．sitting ; to absorb

C．seated ; absorbed

D．seated ; to be absorbed

肝可以合成的血浆蛋白质有（）。

A.白蛋白和纤维蛋白原

B.白蛋白和全部凝血因子

C.白蛋白和球蛋白

D.球蛋白和纤维蛋白原

E.球蛋白和凝血酶原