【正确答案】 A

【答案解析】incredible不可思议的，如：The plot of the book is incredible. infectious传染的；incompatible不能和谐共存的；不相容的；矛盾的(+with)，如：Late hours are incompatible with health. inaccessible达不到的，如：The cave was inaccessible, high up the top of a cliff which no one could climb.