题目

完形填空Howdo you kill your time when you go to work? Most of us stare at our cell phones,1 to make eye contact withothers. We just chat or play games online. Or maybe we're using the timebetween 2 to do our makeup, catch up on emails, or reada few chapters of a book. However, Dina Alfasi takes a very different 3.Eachday she has to travel hours on buses or trains to get to her engineering job ata hospital in Israel. Rather than look at her cell phone in silence, she usesone very special way to have 4 with strangers. It is portraits of the peopleshe meets on public 5 every day that she is t（2011?梧州）2011年上半年，长江中下游遭受百年一遇的大面积干旱，如图是岳阳洞庭湖大桥下裸露的湖床．为了缓解旱情，在一定的条件下，可通过人工降雨的方法向天要水，其中一种人工降雨的方法是把干冰（固态二氧化碳）播撒到云中，使其周围环境温度降低，空气中的水蒸气迅速变成小水滴或小冰晶，导致降雨．下列说法正确的是（　　）A．水蒸气变成小水滴是升华现象B．水蒸气变成小水滴是汽化现象C．水蒸气变成小冰晶是凝固现象D．水蒸气变成小冰晶是凝华现象