冲洗泪道时，若冲洗液完全从原路反流，说明（）
A.泪总管阻塞
B.鼻泪管阻塞
C.鼻泪管狭窄阻塞
D.泪道通畅
E.泪小管阻塞
参考答案：E
---Did you get to school on time yesterday?
--- No. An unexpected heavy rain ______ the bus ______the station on time.
A．allowed, reaching
B．stopped, reaching
C．stopped, to reach
D．kept, reaching
角膜圆周上每1mm约为（）圆周度。
A、5
B、6
C、7
D、8
