--- Mom, I’ m going to the graduation dance tonight but I don’t think I look attractive enough.

--- Oh, darling, don’ t worry. _______.

A．They don’t know what beauty is

B．Nobody will care about it

C．You look perfect the way you are

D．Impossible is nothing

高血压患者出现以下哪项表现，能最早提示心功能由代偿期进入失代偿阶段()

A．心尖区第一心音降低

B．心尖区收缩期杂音

C．夜间阵发性气促

D．室性早搏

E．劳力性呼吸困难