第26题: [单项选择]What does the passage tell us about American rivers ?() A. One sixth of them are seriously polluted. B. One third of them arc seriously polluted. C. Half of them are seriously polluted. D. Most of them are seriously polluted. 参考答案:B
第36题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard.A. At 7:30 next Saturday. B. At 7:30 next Sunday. C. At 9:30 next Sunday. D. At 10:30 next Sunday. 参考答案:D 答案解析:[解析] 21. When will the two speakers go cycling together