乳痈发于妊娠期者为：
A．有脓B．无脓C．脓已成熟D．脓浅E．脓深
参考答案：A
A fridge is used to keep food which goes _______ very _______.
A．badly; quick
B．bad; quickly
C．badly; slow
D．bad; slowly
下列变化的比较, 不正确的是
A．酸性强弱: HClO4> H2SO4> H3PO4> H4SiO4
B．原子半径大小: Na > S > O
C．碱性强弱: KOH > NaOH > LiOH
D．还原性强弱: F－> Cl－> I－
