What is the main idea of the passage？A．What should be done to help those affected by autis

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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