单项选择题
A.a dead writer B.the water in Deleville C.a dangerous murderer D.a harmful substance (物质) used to kill pests
A.her parents were living in London then B.the hospitals in Deleville were full at that time C.she was the daughter of a famous doctor in London D.doctors in Deleville were not sure about the cause of her illness
A.quite easy to treat B.the result of thallium poisoning C.a common one D.extraordinarily serious