— Stress can be extremely harmful to your health. Exercise, ______, can reduce its bad effects.

— I can’t agree more.

A．therefore

B．meanwhile

C．besides

D．otherwise

风湿性心脏病伴重度二尖瓣狭窄严重的并发症是（）

A.心房颤动

B.脾栓塞

C.急性肺水肿

D.右心功能衰竭

E.感染性心内膜炎