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Step1: 听音频并跟读单词,熟悉它们的发音和意思
optical illusion 视觉偏差
Uncle Sam Army recruitment poster 山姆大叔的招兵广告
magnification 放大n
ambiguity 含糊,模棱两可n
masterpiece 名作n
Step2: 听音频,用简洁的文字回答下面的题目
1. Why does the speaker mention the Uncle Sam Army recruitment poster ?
2. According to the psychologist, what is wrong with the name of Mona Lisa effect?
3. What is the result of the investigation ?
Step2: 关注微信公众号“顶萃英语”,回复关键词“高阶21”可获取参考答案。