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  3. Among the raft of books, articles, jokes, romantic comedies, self-help guides and other writings discussing marriage, some famil

Among the raft of books, articles, jokes, romantic comedies, self-help guides and other writings discussing marriage, some famil

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问题    Among the raft of books, articles, jokes, romantic comedies, self-help guides and other writings discussing marriage, some familiar ideas often crop up. Few appear more often than the 【C1】______that many old couples look alike. You have probably seen it before—two elderly people walking hand-in-hand down the street or sitting at a cafe,【C2】______each other so strongly that they could be siblings. Do these couples actually look alike, and if【C3】______what has caused them to develop this way?
   A study published in the March 2006 issue of Personality and Individual Differences may have the【C4】______. Twenty-two people, divided equally between male and female, participated in the study. They were asked to judge the looks, personalities and ages of 160 married couples. The participants viewed photographs of men and women separately and were【C5】______told who was married to whom. The subjects consistently judged people who were married【C6】______being similar【C7】______appearance and personality. The researchers also found that couples who had been together longer appeared more similar.
   This result【C8】______itself may not seem surprising, but the study also offered some answers on【C9】______ couples may look alike. To start, consider that life experiences can end up being reflected physically. Someone【C10】______is happy and smiles more will develop the facial muscles and wrinkles related to smiling. The years of experience of an elderly couple’ s marriage, happy【C11】______not, would then be reflected in their【C12】______.
   Genetic influences are【C13】______ factor. A past study showed that genetically similar people have better marriages. Such families have【C14】______incidents of child abuse and a lower rate of miscarriages. People also appear to be more selfless【C15】______involved with genetically similar partners.
【C9】
选项
答案why
解析 联系上下文以得出这里是说“研究也为夫妻为何相像提供了一些答案”，表示为何，这里只能用why。
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