When McKie brings friends or volunteers to the area where she works, most of ________ spend the first day sobbing.

A．them

B．whom

C．that

D．which

关于二尖瓣关闭不全杂音的传导，正确的是（）

A.向颈部传导局限

B.不传导

C.向左腋下、左肩胛下区传导

D.向胸骨上窝传导

E.向心尖部传导