第13题: [单项选择]Questions 23 to 25 are based on the conversation you have just heard.[A] The effect of the atmosphere on rainfall. [C] How water originated on earth. [B] How conditions on earth support life. [D] A new estimate of the age of earth. 参考答案:C 答案解析:[听力原文]23-25 M: How did you like yesterday’s astronomy class W: It was interesting. But the po
第19题: [单项选择]Rh（-）个体在汉族人群中占（） A. 0.01％～0.1％ B. 0.1％～0.2％ C. 0.2％～0.5％ D. 0.5％～0.8％ E. 1％～2％ 参考答案:C 答案解析:Rh系统内有45种不同的抗原，D抗原最为重要。根据红细胞上D抗原的有无，可分类红细胞为Rh阳性或Rh阴性。大约15％的白种人为Rh阴性，0.2％～0.5％汉族人为Rh阴性。
A. commends B. memorizes C. propagates D. commemorates 参考答案:D 答案解析:[解析] 语义连贯题。结合题干和选项，对死去的战士们当然是一种纪念而不可能是“称赞”(commend)或“宣传”(propagate)，而只能是纪念，常常利用某些仪式，所以选[D]commemorat
