A．Because many things change quickly in the 21st century. B． Because writers are out of date. C．Because sometimes the date of publication is not accurate. D．Because we need to make sure the contents are easy to find.
参考答案A解析: Why we need to pay attention to the book's date of publication?
细节题。文中最后指出几点建议，其中一点，You must note its date of publication because travel is a very practical affair andmanythings change quickly in the 21st century．需要关注出版时间是因为21世纪许多事情变化快，而旅游又是一件很实际的事情。所以，A项为正确答案。
A．Younger Japanese would spend more time on leisure. B．Older Japanese would spend more time on leisure. C．Older Japanese are not content with watching television. D．Younger Japanese would not spend time on dancing.