病愈后有持久免疫力的病毒性肝炎是（）
A.甲型肝炎
B.乙型肝炎
C.丙型肝炎
D.丁型肝炎
E.戊型肝炎
参考答案：A, B
梅核气的临床特点有
A．多见于青中年女性
B．因情志抑郁而起病
C．咽中梗塞的感觉与情绪有关
D．自觉咽中有异物梗塞
E．但无咽痛及吞咽困难
— were electric slippers invented?
—Sorry. I don't know. [ ]
A. Who
B. Whom
C. Of whom
D. By whom
