(单选题)
What do researchers at the University of California want to find out in this study?
A.What is the difference between a fake laugh and a real one.
B.Which part of the brain controls the sound of our laughter.
C.Why do people need to fake laugh when they don’t want to.
D.How to laugh as genuinely as possible when you are faking it.
参考答案：A
参考解析：
细节理解题。根据第一段最后一句“But how can they possibly know the difference?”可知，研究人员想要弄清楚人们是如何区分真笑和假笑的。故选A。
知识点：阅读理解四选一 英语专业基础知识 阅读理解 教师招聘-小学 英语
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