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Thousands of years【C1】______humans began the process of domesticating the dog and shaping what "being a dog" really means. Throu
Thousands of years【C1】______humans began the process of domesticating the dog and shaping what "being a dog" really means. Throu
admin
2013-12-10
38
问题
Thousands of years【C1】______humans began the process of domesticating the dog and shaping what "being a dog" really means. Through careful selection and breeding, an astonishing variety of dog breeds【C2】______been created. Desirable traits have been selected for in various breeds that are of a benefit【C3】______humans. There are some traits, however, that quickly become undesirable when expressed too frequently. Barking is a(an) 【C4】______of a natural behavior that is encouraged in terms of guarding behavior, but becomes a problem when the behavior is produced in excess. A recent health insurance investigation revealed【C5】______the sound of a continually barking dog was cited as the most disruptive and stress inducing【C6】______for humans.
Barking, in addition to whining, howling and growling, is a dog’s【C7】______means of communication. Barking is characterized by a series of short, sharp sounds, that tend to vary【C8】______in tone or pitch. A dog’s bark【C9】______signify territorial protection, exertion of dominance, or expression of some need.【C10】______, barking is "a means of communication triggered by a state of excitement." Being a natural trait, barking is not considered a behavioral problem,【C11】______it is produced in excess.
The key to solving the problem of excess barking in your dog begins with an understanding of what is causing【C12】______behavior. Once you have determined a cause,【C13】______have a greater chance of choosing the most effective solution(e. g. , more exercise)or behavioral modification. Modifying such an instinctive and natural behavior【C14】______barking can be difficult, and may require considerable patience, time, and hard work.【C15】______, however, are possible, and worth the effort.
【C1】
选项
A、since
B、before
C、ago
D、later
答案
C
解析
Since从……以来,before……以前,ago……以前,later……以后。这里是考查before和ago的区别。二者都表示以前,before和过去完成时连用,表示从过去起的若干时间以前。Ago与过去时连用,表示从现在起的若干时间以前。根据文章含义,从现在起的数千年以前,时态是过去时,选项C是正确的。
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