第19题: [单项选择]下列材料中吸水率最大的是: A. 花岗岩 B. 普通混凝土 C. 木材 D. 黏土砖 参考答案:C 答案解析:[解析] 各种材料的吸水率相差很大。例如,花岗岩等致密岩石的吸水率仅为0.5%~0.7%,普通混凝土为2%~3%,黏土砖为8%~20%,而木材或其他轻质材料的吸水率则常大于100%。
第36题: [单项选择]According to the first paragraph an American student is allowed to ______. A. live in a different university B. take a particular course in a different university C. live at home and drive to classes D. get two degrees from two different universities 参考答案:B 答案解析:[解析] 事实细节题。文章第一段最后一句话It is possible for a student to move between one university and another during