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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【C5】________male and female,【C6】________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【C7】________told who was married to【C8】________. The subjects consistently judged people who were married【C9】________being similar【C10】________appearance and personality. The researchers also found that couples who had been together longer appeared【C11】________similar.
    This result【C12】________itself may not seem surprising, but the study also offered some answers on【C13】________couples may look alike. To start, consider that life experiences can end up【C14】________reflected physically. Someone【C15】________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【C16】________not, would then be reflected in their【C17】________.
    Genetic influences are【C18】________factor. A past study showed that genetically similar people have better marriages. Such families have【C19】________incidents of child abuse and a lower rate of miscarriages. People also appear to be more selfless【C20】________involved with genetically similar partners.
【C13】
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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