下列哪项不是因基质微环境异常导致的角膜缘干细腕缺乏()
A.放射线所致角膜病
B.先天性无虹膜
C.边缘性角膜炎
D.严重微生物感染
E.神经麻痹性角膜炎
参考答案:D
开放性损伤不包括().
A.挫伤
B.切伤
C.裂伤
D.皮肤脱伤
E.擦伤
They ______ Hong Kong twice. [ ]
A. have gone to
B. have been to
C. have been in
D. have gone in