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  3. Thousands of years【C1】________humans began the process of domesticating the dog and shaping what "being a dog" really means. Thr

Thousands of years【C1】________humans began the process of domesticating the dog and shaping what "being a dog" really means. Thr

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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.
【C14】
选项 A、like
B、similar
C、seems
D、as
答案D
解析 Like相像，similar近似，seems似乎，as比如。文章的意思是：比如狗叫。选项D是正确的。
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