原题是:In (medical) and dentistry, radiography is (invaluable) for diagnosing bone damage (tooth) decay, and internal (disease).
答案给的是A。
可我觉得这道题错误出在C啊,整句话应该改为:In medical and dentistry, radiography is invaluable for diagnosing bone damage,teeth decay, and internal disease.
应该翻译成在体检和牙科领域,X射线用于检查骨损伤,牙齿的退化和内科疾病。