掌跖角化病的共性有（）
A.主要累及掌跖
B.无特效口服药物治疗
C.局部治疗为主
D.大多为先天性，有家族史
E.以上都是
参考答案：E
The teacher together with the students______ discussing Reading Skills that ________ newly
published in America. [ ]
A. are; were
B. is; were
C. are; was
D. is; was
砌筑第一皮砖，如水平灰缝厚度超过（）m，要用细石混凝土找平。
A．12
B．15
C．20
D．30
