科技利弊议论文写作 — 英语词汇题
题目
为使下列科技利弊议论文段落体现转折论证与总结结论，请根据中文提示补全单词，每空一词。Online learning gives students flexible access to lessons. H____（然而）, it may reduce face-to-face communication. T____（因此）, schools should combine online tools with classroom discussion.