专四
单选题The author's purpose in writing this passage is to
参考答案：C进入在线模考
细节推断题。末段倒数第3旬提到All that is under investigation，C与此同义，为正确答案。A、B只是该段中的个别例证；最后一句提到要进一步研究兄弟姐妹是如何影响我们的，D项的表述与原文有出入。
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