The example of cancer patients is used by the author to show that ______.A、medical resources are often wasted
B、some treatments are too aggressive
C、doctors are helpless against fatal diseases
D、medical costs are becoming unaffordable
【正确答案】：A
【题目解析】：由题干定位于第二段中……even if it’s useless可知，药物治疗没有用，答案A选项是正确的；其他选项都没有提到。