What is the main idea of the passage？A．What should be done to help those affected by autis
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What is the main idea of the passage？
A．What should be done to help those affected by autism.
B．A genetic base should be found to study the cause of autism.
C．Some truths about autism.
D．What is autism and what we have known about autism.
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
各段的主要内容．也就是本文的主题。而各段的主题一般由首句来体现。观察各段，分别介绍了自闭症的概念、表现以及简单的治疗方法。所以，综合来看，只有[D]项对文章概括最全面。