题目

你校将举办英语演讲比赛。请你以Be smart online learners为题写一篇发言稿参赛，内容包括：1. 分析优势与不足；2. 提出学习建议。注意：1. 词数100左右;2. 题目和首句已为你写好。 答案：【答案】one possible version:Be smart online learnersNetwork learning has increasingly become an important means for people to acquire knowledge and solve problems.But being smart online learners has its advantages and disadvantages.First of all, as smart online learners, we can make full use of the most extensive educational resources to broaden the horizon. Besides, We can take the initiativ利用下图装置电解硫酸铜溶液，下列说法正确的是 A．b电极上发生氧化反应 B．该装置能将化学能转变成电能 C．电解质溶液中Cu2+从b电极向a电极迁移 D．若a为铜，则a的电极反应式为：Cu-2e-=Cu2+