The baby is hard to          .        [ ]

A. take care

B. look after them

C. take care of

D. feed them

在风湿性心脏瓣膜病中，被累及最多的瓣膜为

A．主动脉瓣
B．三尖瓣
C．肺动脉瓣
D．二尖瓣
E．肺动脉瓣+三尖瓣