普通型流脑( )
A．皮肤淤点淤斑B．大片淤斑伴中央坏死C．充血性皮疹D．皮肤溃疡及焦痂E．疱疹
参考答案：A
器质性二尖瓣狭窄不出现于（）
A.第一心音亢进
B.Austin-Flint杂音
C.舒张期隆隆样杂音
D.S2分裂
E.开瓣音
. Mary was only too ready to help others, seldom, _____, refusing them when they turned to her.
A．if never
B．if not
C．if any
D．if ever
