绒癌的病理特点哪项除外（）
A.滋养层上皮细胞增生
B.肿块中大量出血
C.肿块有坏死
D.有绒毛结构
E.易发生血道播散
参考答案：D
补气药中，能平补肺脾肾的药物是（）
A.人参
B.黄芪
C.党参
D.山药
“I_______ a teacher, you_______ a student, your father_______ a worker", Mrs. Wang says to Jill.
A．am; is; are
B．is; am; are
C．am, are, is
D．am; is; is
