1.The hunt for the puma began in a small village where a woman picking blackberries saw "a large cat" only five yards away from her.
知识点1 where引导定语从句，修饰village。
知识点2 搜索：hunt，search。
知识点3 the hunt for sb./sth.抓捕某人/某物。hunt for a job找工作，Missing Wanted寻人/寻物启事，People Search/Wanted/Missing寻人，Wanted通缉。
2.It immediately ran away when she saw it，and experts confirmed that a puma will not attack a human being unless it is cornered.
她刚看见它，它就立刻逃走了。专家证实，美洲狮非被逼得走投无路，是决不会伤人的。
知识点1 when引导时间状语从句，and连接两个并列分句，第二个分句中的that引导宾语从句，说明confirm的内容，unless引导条件状语从句。
知识点2 （1）corner作动词常用于被动语态：sth./sb. be corned某人/某物被逼入绝境
（2）与corner搭配的介词：at the corner of the street 在街道的拐角，in the corner of the room 在房间的角落里，on the corner of the desk 在桌子的一角。
知识点3 （1）unless和if…not均表示否定的条件，一般可互换：Unless you have more pratice,you will fail in the dtiving test.=If you do not have more pratice,you will fail in the dtiving test.
知识点4 写作模板：The teacher told him that he would never pass the examination unless he studied hard.
3.The search proved difficult，for the puma was often observed at one place in the morning and at another place twenty miles away in the evening.
知识点1 句子中含有一个for引导的原因状语从句。特别注意的是：地点状语at one place 和at another place，时间状语in the morning 和in the evening形成对照。
知识点2 because和for的区别：because知道上的或自然的原因，语气较强，for多指逻辑上的判断。比较：Itmust have rained,for the river is so high.He must be at home,for the light in his room is on.
知识点3 twenty miles away做后置定语，修饰place。地点副词和时间副词做后置定语：the house ahead前面的房子，the conclusion below下面的讨论，the plan last year去年的计划。
