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D本题问“为什么宠物狗喜欢为主人表演技能？”根据第三段中Training is also an easy way to establish the social rank order... You can teach your dog its subordinate role by teaching it to show submission to you. Most dogs love performing tricks for you to pleasantly accept that you are in charge.(训练也是建立社会等级的方法。你可以通过教狗表示服从你，来教它扮演从属的角色。 大多数的狗都喜欢为你表演技能以此来表示乐意接受你的主宰地位。)所以被驯服的宠物狗喜欢 为人表演技能的原因是to show their willingness to obey。所以D是正确答案。
vt. 使富足，使肥沃，添加元素
