我国目前发现的最早的医学文献是
A.《内经》
B.《神农本草经》
C.《金匮要略》
D.《周礼》
E.《五十二病方》
参考答案:E
Mr. Zhang has retired already. He in our school for over thirty years.
A.has worked
B.had worked
C.worked
D.was working