岩石的密度大小主要取决于（）。
A、岩石的成分和含量
B、岩石的埋藏深度
C、岩石的胶结物
D、岩石的孔隙度和孔隙充填物
参考答案：A, B, D
Although he was disabled when he was only ten years of age, yet he aimed _____, for which his classmates spoke _______ of him.
A．high; high
B．highly; highly
C．highly; high
D．high; highly
下列哪项不是偏头痛的特征（）。
A.多为偏侧
B.发作性
C.常伴恶心、呕吐
D.搏动样头痛
E.一般持续15分钟至3小时
