A. World War I

B. World War II

Correct answer: a

Although plastic surgery is a new specialty with a history of nearly a hundred years, the surgery to repair body surface defects can be traced back to ancient times. For example, cleft lip was recorded in the Book of Jin in China BC, and nasal reconstruction and earlobe repair were recorded in India in the 6th-7th century BC. /kloc-in the 9th century, more and more people engaged in plastic surgery, especially the appearance of skin grafting and a large number of plastic surgery books, promoted the professional development of plastic surgery. Maxillofacial injuries played an important role in the treatment of World War I in the early 20th century.