——I’ve read another book this week .

——Well , maybe         is not how much you read but what you read that counts .

A．this

B．that

C．there

D．it

二尖瓣狭窄患者，心尖区听到舒张期隆隆样杂音，关于该杂音不正确的是（）

A.心功能改善后杂音明显

B.心率越快杂音越明显

C.左侧卧位杂音明显

D.杂音局限

E.Valsalva动作时杂音可减轻