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第二节审题指导》本题要求就“中学生如何为世界抗疫尽一份力”写一篇稿件。考生可国绕这一话题的背景、具体做法、表明信心三方面来写。时态为一般现在时和一般将来时。题目内容贴近考生日常生活，易于考生动笔。第一段要给出全球疫情这一背景，主体段介绍具体做法，最后一段表明信心。【参考范文】Over the past two years,the novel coronavirus has madeits way around the world.It has a strong impact on our lifeand study.In order to ease the serious conditions,all studentshad better do as follows.First,stay at home and don't go out unless necessary,which is beneficial to yourself and others.Second,do wearprotective masks outdoors andIwash hands as often aspossible.And lastly,everyone ought to have a positiveattitude to the campaign against the disease.We have confidence that we will win the fight soon.亮点评析)范文层次分明，要点齐全，语义通顺。作者在文中使用了一些高级词组，如make one'sway,have a strongimpact on,in order to,be beneficial to,as often as possible等；还有不少高级句式，如which引导的非限制性定语从First,stay at home and don't go out unless necessary,which is beneficial to yourself and others.)和that引导的同位语从句(We have confidence that we will win the fightsoo.)等。这些高级词组和高级句式的使用为文章增色不少。
8.B【考查点】本题考查有机化合物。OH【解析】根据紫花前胡醇的结构简式可知，其分子式为C4H404,A正确；紫花前胡醇结构中含有的碳碳双键、一CH一均可将Cr,0ˉ还原为C+而使酸性重铬酸钾溶液变色，B错误；紫花前胡醇结构中含有的酯基能够发生水解反应，C正确；紫花前[点拨]在酸性（或碱性）条件下，酯可以发生水解反应生成相应的羧酸（或羧酸盐）和醇。胡醇结构中与一0H相连的碳原子的邻位碳原子上连有氢原子，能发生消去反应生成碳碳双键，D正确。
