回答题According to the first paragraph, the experiment is designed by Ell-考呗网题库移动版
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参考答案D
解析:

【D】
【定位】根据题干和选项可定位到第1段。
【解析】根据第1段最后一句话可知,艾伦·兰格做这一实验的目的就是想弄明白人们对自己年龄的心态能否引起健康方面的实际变化。故选项D正确。

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