天疱疮的水疱是（）。
A.角层下水疱
B.表皮下水疱
C.表皮内水疱
D.表皮下脓疱
E.角层下脓疱
参考答案：C
---How long have you been here?
---Only about three minutes. Xiaoming and Mary _____here with me.[ ]
A. walk
B. have walked
C. had walked
D. walked
电脑辐射会导致哪些疾病？
