– Look at these factories. I hate them. They____ many rivers here.

--Yes. Something ______ to stop the pollution.

A．polluted, must do

B．had polluted , must be doing

C．have polluted , must be done

D．were polluting, must be done

下列做法中不违背医学伦理学无伤害（不伤害）原则的是（）

A.因急于手术抢救患者，未由家属或患者签手术同意书

B.发生故意伤害

C.造成本可避免的残疾

D.造成本可避免的病人自杀

E.造成本可避免的人格伤害