A. The difficulty of raising animals on farms in colonial America. B. Traffic problems in colonial American cities. C. Population growth in colonial American cities. D. Economic conditions in colonial Americ 参考答案:B 答案解析:[听力原文]4-7 M: Hey Teresa! thanks for agreeing to help me review all this history material. W: N
第6题: [单项选择]以下属于皮肤纤维瘤病变特点的是 A. 主要为成熟的纤维细胞 B. 可伴玻璃样变性 C. 可见小血管增生明显 D. 可见多核组织细胞 E. 以上均是 参考答案:E