单选题：What is the main purpose of the passage?

题目内容：
What is the main purpose of the passage? A．To outline the research findings on the brain structure.
B．To explain the link between sex and brain structure.
C．To. discuss the various factors that cause brain differences.
D．To suggest new areas in brain research.
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答案解析：

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分类：公共英语五级  题型：单选题
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