预后最差的天疱疮类型是（）。
A.寻常型天疱疮
B.落叶型天疱疮
C.红斑型天疱疮
D.增殖型天疱疮
E.脂溢性天疱疮
参考答案：A
Please _____ my homework to Jack, and tell him to _____ to the math teacher. [ ]
A. hand in; pass it on
B. pass on; hand in it
C. pass on; hand it in
D. hand in; pass on it
溶剂法分离汉防己甲素和汉防己乙素时，常用
A．乙醚
B．苯
C．冷苯
D．盐酸
E．氢氧化钠
