能治疗瘿瘤的药物是（）
A.瓦楞子
B.海浮石
C.海蛤壳
D.黄药子
E.海藻
参考答案：A, B, C, D, E
How did it________that the ancient building was burnt down in an hour?[ ]
A. happen
B. occur
C. take place
D. come about
囊状水瘤多发于（）。
A.2岁以后
B.2岁以前
C.青少年
D.成人
E.老年
