题目

（2013•连云港）科学探究是研究和学习生物学的重要方法．关于“探究烟草浸出液对金鱼呼吸次数的影响”实验的分析，正确的是（ ） A．实验探究的变量是金鱼的条数B．实验进行一次即可，不需要重复实验C．实验中起对照作用的是烧杯中盛有清水的一组D．实验结论是烟草浸出液能加快金鱼的呼吸频率19．初中三年的学校生活就要结束了；回顾三年的学校生活；你（Jack）感慨万分．校园网的英语论坛开辟了"My School Life"专栏，供同学们发表感言．请你为该专栏写一篇短文，回顾自己三年的学校生活．短文主要包括：回顾、感谢、祝愿等：回顾应涉及到生动有趣的课堂：活泼可爱的同学，丰富多彩的活动：自己的优点及不足等，你可以适当发挥．要求；字数在100词左右，第一句已经给出，不记入总数．文中不得出现真实姓名及校名．I'm lucky to study in this beautiful school．The teachers are great．They always try to make their lessons lively and interesting．The classmates are lovely and friendly．The school life is rich and colorful．They make me happy every day．In the past three years，I am hardworking and have made great progress．I do well in the exams．I am good at communicating and I like to make friends with others．However，I have problems，too．I will spend less time online．I will do more sports and become stronger．Thank you my teachers and classmates．Wish my school more beautif ul，my teachers and classmates a happy life!Jack from Class 3．