（2015•湖南长沙）端午节即将到来，相传端午节最初是为了纪念一位战国时期伟大的爱国诗人，其作品中所反映出来的爱国主义思想和上下求索精神，融汇成湖湘文化的重要特征。这位诗人是（  ）       

    Over time I____(change) quite a lot. I could simplify difficult sums when I began as a calculating machine. After I was programmed by an____(operate), I could logically produce an answer quicker than any person. At that time it was considered a____(technology) revolution. In 1936, I could solve difficult problems as a universal machine. From then on, my memory has developed so much that I never forget anything I have been told. Since the 1970s, many new ____ (apply) have been found for me. For example, I have been sent to explore the moon. My goal is ____(provide) humans with a life of high quality.Daisy desired to help ____ (endanger) species of wildlife because a large number of animals are ____(die) out. One day, a ____ (fly) carpet took her to a distant land____she could find antelopes that gave fur to make sweaters. Then she met an elephant in Zimbabwe and was told that elephants used to be hunted ____ mercy. But now people know the importance of wildlife protection.

暴露在空气中氢氧化钠溶液容易变质，发生反应的化学方程式为：____。
检验已经变质的方法有：
（1）往待检溶液滴加____（酸）溶液，观察到的现象是____；
（2）往待检溶液滴加____（碱）溶液，观察到的现象是____；反应的化学方程式为____。