While income worry is ____ rather common problem of the aged,loneliness is another problem that ____aged parents may face.

A．a;/

B．the;/

C．a;the

D．the;the

关于冠心病患者保持大便通畅的叙述，不正确的是（）

A.卧床会使肠蠕动减慢

B.饮食中增加粗纤维食物

C.便秘时采用大量不保留灌肠以导泻

D.用力排便可诱发和加重心衰

E.用力排便可诱发严重心律失常