听力首页 听力教程 VOA慢速 英语歌曲 外语下载 英语小说 英语词典 在线背单词 听力论坛 韩语学习
听力专题 英语教材 VOA标准 英语动画 英语考试 资源技巧 英语翻译 单词连连看 听力家园 德语学习
听力搜索 英语导读 BBC英语 英语视频 英语电台 英语QQ群 外语歌曲   英语游戏 英语网刊 日语学习
当前位置: 英语听力论坛 » 【四级教室】 » 四级练习2012.01.02
返回列表 发帖

四级练习2012.01.02


       
       




The dog has often been an unselfish friend to man.It is always grateful to its masters.It helps man in many ways.(1)_______________________.They help police to catch criminals.Some dogs are trained to lead blind people.The dogs that help in criminal investigations are trained at a school called the Military Dog Studies branch of the US Air Force in Lackland, Texas.The dogs to be trained are selected by an air force team.This team visits large cities across the country to buy the dogs.They may buy dogs from private citizens for up to $750 each.Some citizens freely give their dogs.The dogs selected must be healthy, brave and aggressive.They must be able to fight back if they are attacked.The dogs chosen are between the ages of one and three.They are given a medical examination when they arrive at the school.Their physical examination includes X-rays and heart tests.(2)_______________________.After this course,the best dogs are selected to go on another 9-week course.They learn drug-sniffing or bomb-sniffing.After this course,the dogs are ready for their jobs in the cities or on air force bases.The training given to a drug-sniffing dog is different from that given to a bomb-sniffing dog.A drug-sniffing dog is trained to scratch and dig for the drugs when he sniffs them.A bomb-sniffing dog sits down when he finds a bomb.That is the alert for hidden explosives.


本帖隐藏的内容需要回复才可以浏览

支持一下

支持一下啦~~~~~~~~~~~~~~~~~~~

TOP

又下雪了哦,哎冷死了。

TOP

返回列表