单选题 It would be _____to think that this could solve all the area’s problems straight away.
【正确答案】 D
【答案解析】[解析] 题干句意为:认为这能解决此地区所有的问题是很______的。D选项naive意为“天真的,单纯的,纯朴的”,符合文意。因此,正确答案是D。