It is generally believed that teaching is ________ it is a science.

A．an art much as

B．much an art as

C．as an art much as

D．as much an art as

舒张早期奔马律与生理性第三心音的区别不包括

A．舒张早期奔马律出现在有严重器质性心脏病的患者，生理性第三心音出现在正常人

B．舒张早期奔马律不受体位影响，生理性第三心音于坐位或立位消失

C．舒张早期奔马律出现在心率较慢时，生理性第三心音出现在心率较快时

D．舒张早期奔马律的额外心音与S₁和S₂的间距相仿

E．生理性第三心音与S₂的间距近于S₁和S₂的间距