Although the painting is very ____ pleasant, it is thought to be copied with a modern printing machine．

A．visually

B．highly

C．physically

D．mentally

下列有关β受体效应的描述，正确的是（）

A.心肌收缩加强与支气管扩张均属β₁效应

B.心肌收缩加强与支气管扩张均属β₂效应

C.心肌收缩加强与血管扩张均属β₁效应

D.心肌收缩加强与血管扩张均属β₂效应

E.血管与支气管扩张均属β₂效应