题目

(09如东县学业水平测试)在叶绿体色素的提取和分离实验中，用来溶解色素的是                      A. 二氧化硅         B. 碳酸钙             C. 无水乙醇           D. 层析液 答案：答案：C假定英语课上老师要求同桌之间交换修改作文,请你修改你的同桌写的以下作文，文中共有10处语言错误。错误涉及一个单词的增加,删除或修改。增加: 在所缺词处加一个漏字符号(∧),并在其下面写出该加的词删除: 把多余的词用斜线(＼)划掉.修改: 在错的词下划一横线,并在该词的下面写出修改后的词.注意: 1. 每处错误及其修改均仅限一词. 2. 只允许修改10处,多者(从第11处起)不记分.例如：It was very nice to get your invitation to spend ∧weekend with you. Luckily I was                                                                                                                                                                                the                        amcompletely free then, so I’ll to say “yes”. I’ll arrive in Bristol at around 8 pm in Friday evening.                                                                                                                        onIt is five years now since I graduate from No.3 High School. Last Saturday, the class that I was on held a get-together, which took us a long time prepare. It was indeed not easy to get in the touch with everybody and set a well time for all of us. We all enjoyed this precious day greatly, remember the time we spent together and the people they were familiar with. It was a pity which some of us were not present as they had gone to abroad for further studies, but they called back or sent greeting card from different places.