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1、高二英语Unit7知识精讲1. AIDS is a disease that breaks down the bodys immune system and. 注意：break down可作及物动词, 作“破坏;使失效”解。也可作不及物动词, 常表示“(计划, 谈判等) 受挫折、失败”或感情失去控制”或“(机器)停止运转”2. As with most diseases and disasters, the young suffer the most.as with = it is the same with. 这里 as 是连词，意思是“和一样”。3. persuade sb. to do
2、sth. 说服某人做某事 The salesman persuaded us to buy his product.那个销售人员说服我们买了他的产品。比较：The salesman tried to persuade us to buy his product, but we didnt. 4. as long as: 和一样长, 这里指时间, 也可指长度。You can stay here as long as you want. (指时间)This stick is as long as that one. ( 指长度)as long as或so long as作为连词，引导条件状语从句，
3、意为“只要”。e.g. As/So long as you keep it up, you will succeed.4.For some, medicine can help keep them alive. 关于help 的词组：help sb. with sth. 帮某人某事help sb. (to) do sth. 帮某人干with the help of 在的帮助下help oneself to sth. 随便,自取(食物)cant help doing 禁不住干cant help but do 不得不干5.课本上新词组：be/become infected with 被染上get
4、tested for 对.进行测试take notes of 做笔记a lack of 缺乏all day long 整天；从早到晚take sample of 取样spread from one person to another at any time 随时；任何时候think of as 认为teach sb. a lesson 给某人上课take chance to do 抓住机会做某事 to the full/fullest 充分地；尽情地；完全地care for 关心；照顾be unable to do 没能力做某事protect against 与protect from同意sl
5、ow down 减弱；减缓；减速fight against 与战斗but for 要不是；如果没有There is no chance of doing sth.6. 其他重要词组：persuade sb. to do 说服某人做某事persuade sb. into doing 劝说某人做某事persuade sb. out of doing sth. 劝说某人不做某事persuade sb. of sth. 使某人相信某事 be lacking in 缺乏（品质、特点）be available for sth. 有空做某事recover from 从恢复过来break down 毁坏、镇压
6、、分解recover oneself 恢复健康、镇定下来、重新站稳live with 忍受、接受、与住一起(be)free from 摆脱；无的；免于7.注意区分：for the moment 暂且；暂时；眼下；目前for a moment 一会儿at the moment 此刻；那时in a moment 一会儿之后die of 死亡（正常）die from 死亡（意外）8.as if 的用法：(1) . as if sb./sth. were/did/had done sth.(2). as if it is going to be(3). as if to do/doing用心 爱心 专心 119号编辑 2
