Mr Smith, _____ of the _____ speech, started to read a novel. 

A．tired; boring

B．tiring; bored

C．tired; bored

D．tiring; boring

最容易发生疝内容物坏死的临床类型是（）。

A.易复性疝

B.绞窄性疝

C.难复性疝

D.滑动性疝

E.嵌顿性疝内容物卡住，不能还纳