A. Human factors. B. Economic factors. C. Climatic factors. D. Population factors. 参考答案:C 答案解析:[定位] 第1段第1句。 [解析] 题目询问人们通常认为是什么原因导致了北非的衰落。这是对第1句的改写。故选项C正确。 [点睛] 选项A是地质学家认为的更主要的因素。选项B和D是无关信息。
第24题: [单项选择]Passage Three Questions 32 to 35 are based on the passage you have just heard. A. They are great soldiers. B. They are civilized. C. They are intelligent because they are good at fighting. D. They are right if they win the war. 参考答案:A 答案解析:[听力原文] What does it probably mean if people "are good at fighting"