题目

前段时间达州大部分地方出现较长时间的干旱，气象部门实施人工降雨，用飞机在高空喷洒干冰，干冰进入云层后迅速成为气体，并从周围吸收大量的热，空气温度急剧降，使空气中水蒸气成小冰晶，这些冰晶逐渐变大而下降，遇暖气流后吸收热量而为雨滴落到地面.（均填物态变化名称） 答案：【1】升华【2】凝华【3】熔化Animals suffered at the hands of man       they were destroyed by people to make way for agricultural land to provide food for more people. A．in which         B．for which           C．so that        D．in that