参考答案

正确答案：D
解析：本题是细节题。选项A．Americans like to claim happiness在文中并没有涉及；选项B．American college students are active受了文章第二段中“The U．S．is pretty active”的影响；选项C．America has close relationship with Slovenia与文章第二段中“tied with Slovenia”表达的不是同一概念，文章中是说美国与斯洛文尼亚在幸福感上同处第八的排名，而不是两国的关系；选项D．Americans are not as happy as they appear to be才是真正的答案。第二段最后一句“It would appear that merely living as if you are No．1，and running around the world shouting you are No．1，doesn’t mean that you feel like No．1 inside．”明确告诉我们表面现象并不能说明你的内心感受，与选项D表达的内容完全一致。