31.(A)unless　(B)since　(C)lest　(D)although

57.Which of the following statements is true according to the text? 　　(A)Doctors will be held guilty if they risk their patients death. 　　(B)Modern medicine has assisted terminally ill patients in painless recovery. 　　(C)The Court ruled that highdosage painrelieving medication can be prescribed. 　　(D)A doctor's medication is no longer justified by his intentions.