第11题: [单项选择]水果店有苹果、香蕉、桃子若干,卖出20千克苹果和16千克香蕉后,质量之比为5:4:3;又卖出去30千克香蕉和10千克桃子后,质量之比为2:1:1,问开始时苹果、香蕉、桃子的质量比是多少 A. 10:8:5 B. 9:8:7 C. 3:2:1 D. 8:6:3 参考答案:A 答案解析:[解析] 方法一:设卖出去20千克苹果和16千克香蕉后,苹果、香蕉、桃子的质量分别为5x、4x、3x,则4x-30=3x-10,得x=20,则开始时有苹果5x+20=120千克,有香蕉4x+16=96
第15题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.{{/B}} A. More than six thousand million. B. More than two thousand million. C. More than one thousand million. D. More than three thousand million. 参考答案:B 答案解析:[听力原文]
How many people suffer from diseases related to dirty water