先天性内斜视的手术时机多选择在( )前
A.3岁
B.4岁
C.1岁
D.2岁
E.6个月
参考答案:C
解析:先天性内斜视的手术时机多选择在2岁前手术,以增加获得双眼单视的机会。
新鲜骨折的时间期限是伤后
A.1d内
B.3d内
C.5d内
D.2周内
E.4周内
Ben was busy taking a training class ______ we had to wait for himfor half an hour. [ ]
A. so
B. if
C. or
D. but