题目内容
完形填空
Animals perform many useful and amusing jobs. Dogs are particularly valuable in guiding the blind, 1 property (财产) , finding 2 people, and hunting criminals(罪犯) . Horses are used in guarding herds (牧群) , carrying men in lands where there are no roads, and helping farmers work their land. Pigeons 3 to carry message. Wild animals from the jungles. fonts and seas are very popular performers in 4 and motion pictures(电影) . People realize that, 5 animals may not have the same intelligence as 6 , they are smart enough to learn certain things.
The first thing a dog is taught is to 7 . It should not 8 too long for him to learn commands. Simple orders, such as “sit, lie down, stay there, come here” , can 9 be taught by a child.
Training a dog to be a watchdog often produces unexpected results . Some dogs quickly learn the difference 10 unwanted people and friends. This is 11 their masters welcome friends and invite them into their houses. However, some dogs will always 12 the postman who comes to 13 letters. One explanation for this behavior is that, although the postman to the house often he never 14 the house. Therefore the dog thinks the postman is someone 15 is not wanted, but keeps 16 back anyway.
Dogs are extremely useful as 17 for blind people. When a dog has been properly trained, he will lead his blind master in the right direction and keep him 18 danger. For example, seeing-eye dogs 19 a busy road when cars are coming. 20 their masters command them to do so.
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解析：
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1．D 导解：狗能帮人看家，保护财产(不被偷抢)． 2．A 导解：寻找失踪的人，用lost或missing． 3．B 导解：选项中的long(长期以来)表明要用完成式，从语义来看用被动语态． 4．D 导解：既然是“受欢迎的演员”，下文又有“电影”，显然选D． 5．A 导解：从上下文的意思看用although引导让步状语从句． 6．C 导解：动物不如人类聪明． 7．A 导解：从下文的“了解口令，简单的命令”可知选A，听从主人的指令． 8．B 导解：“用不了太长时间”，本句用了It takes some time for sb. to dosth.句式． 9．D 导解：就连小孩都会教这些命令． 10．B 导解：这两种人的区别． 11．D 导解：表语从句解释具体原因． 12．C 导解：however表明下句要说狗有时敌友不分，下文说到not wanted，keep back，因此选C． 13．A 导解：deliver表示“投递”． 14．A 导解：enter是及物动词，也可用get into表示“进入”． 15．B 导解：定语从句指人，引导词在从句中作主语． 16．C 导解：此处依然讲述邮递员的工作，用keep doing sth. 17．B 导解：盲人的同伴． 18．C 导解：让他远离危险．keep…out of表示“让……躲开”． 19．A 导解：C，D表示“它永远学不会”，而上下文表示“学会了不去做”，因此选A． 20．C 导解：哪怕主人命令也不去做． |
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