题目类型：
单选题
题目内容
His muscles are firmest and his ______ colds and infections is highest.
正确答案
C
题目解析
ignorance of对......无知；independence of对......独立；resistance to对......抵抗；attribution to归因于。句意：他的肌肉最结实，对感冒和感染的抵抗力最强。