_____ you read the sentences , _____ mistakes you’ll make.

A．More carefully, fewer

B． The more carefully, the less

C．The more careful , the fewer

D．The more carefully, the fewer

风心病二尖瓣狭窄患者发生心房颤动后常见的并发症是（）

A.心源性脑缺血综合征

B.动脉栓塞

C.肺部感染

D.感染性心内膜炎

E.完全性房室传导阻滞