单选题：Why is the CDC confident the accuracy of its autism figures?

题目分类：英语六级
题目类型：单选题
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题目内容：

Why is the CDC confident the accuracy of its autism figures? A．Because its surveillance sites are statistically representative of the nation．
B．Because its surveillance sites cover all urban districts and rural areas．
C．Because the CDC made great efforts to prepare and gather the figures．
D．Because the results they get arc more accurate than figures derived in other ways．

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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分类：英语六级题型：单选题

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分类：英语六级题型：单选题

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分类：英语六级题型：单选题

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分类：英语六级题型：单选题

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分类：英语六级题型：单选题