由同一病毒引起的病变是（）
A.单纯疱疹
B.水痘
C.疣
D.带状疱疹
E.手足口病
参考答案：B, D
I have bought two ball pens, _____ writes well.
A．none of them
B．neither of them
C．none of which
D．neither of which
什么是同型发酵、什么是异型发酵？
