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Questions 14 - 16 are based on an interview to Professor Sherwood about his study. You now have 15 seconds to read Questions 14 - 16. What’s the proportion of Americans who said they were very happy in 1996

A．30%.
B．35%.
C．37%.
D．39%.

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单项选择题

单项选择题

Questions 14 - 16 are based on an interview to Professor Sherwood about his study. You now have 15 seconds to read Questions 14 - 16. What’s the proportion of Americans who said they were very happy in 1996 您的浏览器不支持 audio 元素。