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Element II Lesson 6 Selective Breeding
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Selective breeding, however, has also had a negative effect. People have used selective breeding (     ) (     ) (     ) create larger, stronger and wilder breeds to serve (     ) guard or fighting dogs. (     ) instance, the pit bull was (breedを適切な形にしなさい) for its strength and ability to move quickly (     ) (     ) (     ) hold down bulls in fighting rings. Although the practice (     ) bull-baiting is banned (     ) most countries, this breed survives today, often (     ) a family pet. Many people believe this type of dog is dangerous to humans (     ) (     ) its (haveを適切な形にしなさい) been carefully bred. As a precaution, they believe these breeds should be limited or banned. Those (     ) (     ) (     ) banning particular breeds say strongly that genetics shape the animal (     ) be naturally aggressive and potentially dangerous.

Some people insist that aggression is part (     ) a specific breed’s nature. However, others believe that dogs are (     ) naturally aggressive, (     ) it is humans who teach aggression. (「ちょうど〜のように」となるように2語) some people choose cars or clothes to present an image (     ) being young or rich, dogs may also be used as status symbols. For example, people who want to appear strong and (「たぶん危険に」となるように2語) may be interested in specific types of dogs because (     ) the breed’s perceived strength and aggressiveness. (     ) (     ) (     ) match the desired image, the dog owner may then train the dog (     ) act aggressively. These owners teach the dog that good behavior includes (barkを適切な形にしなさい), and in some cases, (attackを適切な形にしなさい). People who are (     ) banning breeds believe that it is not the breed that must be banned. After all, bad owners will produce bad dogs, (「〜に関わらず」になるように2語) the breed. Many breed-banning challengers say that owners should be required to get a license before (ownを適切な形にしなさい) or (trainを適切な形にしなさい) a dog.