(2013·福建毕业班质检)It is said that sixty percent of all energy ________ in the world today is being lost as waste heat.

A．produced

B．producing

C．to produce

D．having produced

原发性肝癌进行肝动脉栓塞治疗时常用的栓塞剂是（）

A.碘化油化疗药物乳剂

B.PVA

C.无水乙醇

D.明胶海绵

E.金属弹簧圈