第20题: [单项选择]NO ONE'S GOING TO CHANGE OUR WORLD was ______. A. an important book published in 1970 B. an idea that nobody would accept C. a record calling on people to conserve nature D. a rule worked out by the United States 参考答案:C 答案解析:[分析] 本题测试点为文章细节的掌握。参见文中第二段倒数第三句:“年青人可能是从一张叫作NO ONE'S GOING TO CHANGE OUR WORLD的唱片中听说的保护地球的吧。”故选C。
第26题: [单项选择]Once you get a drowning man out of the water, if he isn' t breathing, you must first________. A. get him breathing again B. take him to the nearest hospital as soon as possible C. find someone to help you D. call the First Aid Center 参考答案:A 答案解析:[解析]由文章第一段可知本题答案为A。
第27题: [多项选择]扩散式燃烧的特点:() A. 温度分布均匀 B. 燃烧强度低 C. 燃具结构复杂 D. 燃烧速度慢 参考答案:A, B, D