As we all know, it was ____ that resulted in the terrible car accident.

A. because of her carelessness       B because she was careless

C. her being careless                D she was so careless

肝脏的血液供应，主要来自（）

A.肝动脉

B.肝静脉

C.肝小叶中央静脉

D.门静脉

E.肠系膜上动脉