How can nanotechnology be used to make a drug more effective?

细节题。题干：纳米技术怎样让一种药物更有效果?题目中的信息词：make a drug more effective，用信息词定位到第四段最后两句：He talked about cancer drugs already developed with nanotechnology．He says if a drug can target a cancel?locally in the body,then much less of it might be needed，and that means lower side effects．对比分析原文和题目，原文讲“if a drug can target a cancer locally in the body”，如果药物可以针对癌症病灶而不是整个人体，治疗所需药量就会大大减少，副作用也会降低，这就说明药物更有效。选项A内容与原文意思相符，本题答案为A选项。