Every year, Tom remembers to have some flowers ______to her mother on her birthday.

A．send

B．sent

C．sending

D．to send

下列最能断定为心功能失代偿期的是（）

A.心率加快

B.心肌肥厚与心脏扩大

C.心排血量下降

D.有效血容量增加

E.心脏收缩力增强