题目：
Dogs are social animals and without proper training,they will be have like wild animals.They will spoil your house,destroy your belongings,bark excessively,fight other dogs and even bite you.Nearly all behavior problems are perfectly normal dog activities that occur at the wrong time or place or are directed at the wrong thing.The key to preventing or treating behavior problems is learning to teach the dog to redirect its normal behavior to outlets that are acceptable in the domestic setting./;One of the best things you can do for your dog and yourself is to obedience train(驯服)it.Obedience training doesn't solve all behavior problems,but it is the foundation for solving just about any problem.Training opens up a line of communication between you and your dog.Effective communication is necessary to instruct your dog about what you want it to do;Training is also an easy way to establish the social rank order.When your dog obeys a simple request of“come here,sit,”it is showing obedience and respect for you.It is not necessary to establish yourself as top dog or leader of the dog pack(群)by using extreme measures.You can teach your dog its subordinate(从属的)role by teaching it to show submission to you.Most dogs love performing tricks for you to pleasantly accept that you are in charge./;Training should be fun and rewarding for you and your dog.It can enrich your relationship and make living together more enjoyable.A well/|trained dog is more confident and can more safely be allowed a greater amount of freedom than an untrained animal. 21.Behavior problems of dogs are believed to. ［A］be just part of their nature ［B］worsen in modern society ［C］occur when they go wild ［D］present a threat to the community 22.The primary purpose of obedience training is to. ［A］teach the dog to perform clever tricks ［B］make the dog aware to its owner's authority ［C］provide the dog with outlets for its wild behavior ［D］enable the dog to regain its normal behavior 23.Effective communication between a dog and its owner is. ［A］essential to solving the dog's behavior problems ［B］the foundation for dogs to perform tasks ［C］a good way to teach the dog new tricks ［D］an extreme measure in obedience training 24.Why do pet dogs love performing tricks for their masters? ［A］To avoid being punished. ［B］To show their affection for their masters. ［C］To win leadership of the dog pack. ［D］To show their willingness to obey. 25.When a dog has received effective obedience training,its owner. ［A］can give the dog more rewards ［B］will enjoy a better family life ［C］can give the dog more freedom ［D］will have more confidence in himself
答案
21-25 A C C D A
解析
21.选A.文章第一句指出"如果不对狗进行恰当的训练,它们的行为以如同其它野生动物一样"可见狗的行为问题是由其本性所决定的,故选A. 22.选C.文章开始就说明了狗的兽性和在未训练前所具有的破坏性,对于这种情况最好的是驯服它,也正是答案C表述的. 23.选C.文章第二段最后一句说：狗与主人我最有效的交流是让狗知道,你想让它去做什么,很明显这需要一个好的方法,即答案C正确. 24.选D.见第三段最后一句. 25.选A.见最后一段最后一句.