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。An A for Mrs. BartlettI was sitting next to Missy in my ninth-grade world history class when Mrs. Bartlett announced a new project. In groups, we were to create a poster around what we were studying.On a piece of paper, we wrote the names of three friends we wanted in our group. After collecting all the requests, Mrs. Bartlett informed us that she would take into consideration the names we chose and would let us know the results the next day. I was a well-rounded top student in the cl小丽同学用试管给某固体物质加热，实验结束后发现试管靠近底部出现裂纹．请你帮助小丽分析，导致试管裂纹，在实验操作上可能的原因是什么？（至少写出三点）（1） ；（2） ；（3） ．