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甲乙夫妻是当地有名的富商，拥有多处房产，丙为做生意之便，同甲签订了房屋租赁合同，租下其中的一处房产，并办理了相应登记手续。其后数月，甲为解决资金短缺，向丁借款，并把该处房产作为担保抵押给了丁，双方也办理了抵押登记手续，而且双方还约定"如甲不能到期归还借款，该房产自动转归丁所有。"乙知道上述事宜，但未表示意见。 甲丙之间的租赁关系是否有效为什么
Passage One Animals are more like us than we ever imagined. They feel pain, they experience stress, and they show affection, excitement and love. All these findings have been made by scientists in recent years—and such results are beginning to change how we view animals.Strangely enough, this research was sponsored by fast food companies like McDonald’s and KFC. Pressured by animal rights groups, these companies felt they had to fund scientists researching the emotional and mental states of animals.McDonald’s, for instance, funded studies on pig behaviors at Purdue University, Indiana. This research found that pigs seek affection and easily become depressed if left alone or prevented from playing with each other. If they become depressed, they soon become physically ill. Because of this, and other similar studies, the European Union has banned the use of isolating pig stalls from 2012. In Germany, the government is encouraging pig farmers to give each pig 20 seconds of human contact a day, and to provide them with toys to prevent them from fighting.Other scientists have shown that animals think and behave like humans.Koko, the 300-pound gorilla (大猩猩) at the Gorilla Foundation in Northern California, for instance, has been taught sign language. Koko can now understand several thousand English words, more than many humans who speak English as a second language. On human IQ tests, she scores between 70 and 95.Before such experiments, humans thought language skills were absent from the animal kingdom. Other myths are also being overturned, like the belief that animals lack self-awareness. Studies have also shown that animals mourn their dead, and that they play for pleasure.These striking similarities between animal and human behavior have led some to ask a question: "If you believe in evolution, how can’t you believe that animals have feelings that human beings have"Until recently, scientists believed that animals behaved by instinct and that what appeared to be learned behavior was merely genetically-programmed activity. But as Koko the Gorilla shows, this is not the case. In fact, learning is passed from parents to offspring far more often than not in the animal kingdom.So what implications does this knowledge have for humans Because of this, should we ban hunting and animal testing Should we close zoos Such questions are being raised by many academics and politicians. Harvard and 25 other American law schools have introduced courses on animal rights. The purpose of this passage is to tell us that（）
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