疲劳性骨折常常发生在下述哪个部位（）
A.髌骨上极
B.尺骨鹰嘴
C.第二、三跖骨
D.第一趾骨
E.尺骨下段
参考答案：C
--You forgot your keys when you left home in the morning.
--Good heavens,___________.
A．so did I.
B．so I did.
C．so you did.
D．so did you.
瓶尔小草属于厚囊蕨纲。
