议论文引言：一种安全写法
议论文的引言方式往往因人而异，主要是个人习惯使然。比方说，猫头鹰习惯开头造三句：申论主题，集中焦点，话分两头。感觉得到这种意见通常不受采用，难怪谢振礼老师推荐的【隐形模板】一直没有市场。
然而，比较受欢迎的引言写法有好几种，都不忘交代议论文试题的背景。以下Introduction举例来自搜索“tai lieu du hoc”（不属于夜猫子）。有兴趣的学友请直接咨询。
1>Should governments spend money on space exploration, or should they spend the money on problems here on the earth?
With many global concerns such as war, poverty, hunger and pollution, many people question whether nations should waste money on exploring space. However, others are convinced that expenditure on space programs is justified. This essay will examine some arguments for any against space exploration.
2>Are zoos cruel to animals?
Many p
