题目

阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文。Lastnight, my partner John and I went to the levees (堤岸) where I was relearning how to run. He supported on his bike and Iwent as fast or as slow as my old legs wanted to take me. Ahead of us was avery old man with a plastic bag who seemed to be unable to walk a straight line.John said, You keep running, and I will check on him.John washolding his hand. John told the man, We are going to come back this way.If you are still here, we will check on you. The man said he was fine buthe有一种“固体粮虫净”，放在粮仓里能预防粮食生虫，“固体粮虫净”过一段时间会变小，在这个过程中所发生的物态变化是    ．