第15题: [单项选择]He believed that the greatest of his ______ was that he had never had a college education. A. griefs B. misfortunes C. disasters D. sorrows 参考答案:B 答案解析:本题测试词义辨析。grief 意为“忧伤，引起悲伤的事”；misfortune 意为“不幸，灾难”； disaster 意为“巨大的灾难，灾害”，一般指涉及很多人的比较巨大的灾难；sorrow 意为“
第18题: [单项选择]It would appear from the text that avalanches are formed because______. A. a particular section of snow is not thick enough B. there is a slight fall in the temperature C. heavy snowfalls turn into rain D. the ice between different sections of snow melts 参考答案:D 答案解析:[解析] 本题考查细节理解。第三段讲述了雪崩的形成。由于秋季天气变冷，下雪使积雪逐渐形成不同形状的雪块，雪块越积越多，天气变暖，冰雪融化，有的雪块由于太厚，不能与下面的雪块粘连在一起，只要温度稍有增加
