尘肺的病理特征为胸膜斑的是（）
A.矽肺
B.煤肺
C.石棉肺
D.石墨尘肺
E.以上全部
参考答案：C
Why was the house on fire? _______ lightning hit it.
A．Because
B．Since
C．As
D．Because of
基准地价的含义
