第2题: [单项选择]矽肺(硅沉着病)的基本病理改变是 A. 肺组织纤维化和矽结节 B. 肺气肿 C. 胸膜斑 D. 炎症 E. 融合团块 参考答案:A 答案解析:[解题思路] 矽尘进入肺泡后被吞噬细胞吞噬形成尘细胞。尘细胞在肺间质聚集成细胞团且由于尘细胞的崩解产物刺激纤维细胞增生,从而引起纤维化,早期为成纤维细胞、尘细胞以及浸润细胞集成而成细胞性结节,以后细胞
第3题: [填空题]What privilege can these people enjoy ()of the freeway is reserved for them. 参考答案:One lane 答案解析:
由“If several people ride to work in the same car,one lane of the freeway is re served for t
第34题: [单项选择]What stamps does the man want A. Four fifties. B. Four tens. C. Four fifties and tens. 参考答案:C 答案解析:[听力原文]8-9 M: Do you happen to have any stamps in your place W: Yes, I have some. What stamps