---What do you think of the old couple?

-----It was an act of _____that they distributed food among the homeless.

A． hardship

B． psychology

C． routine

D．mercy

适用于检查直肠脱垂的体位（）

A.蹲位

B.截石位

C.左侧卧位

D.膝胸位

E.右侧卧位