由最后一段的倒数第二句话“You must also keep an open eyes on its date of publication because travel is very practical matter and many things change quickly in the 21st century.”可知出版的日期要注意，因为在21世纪的今天，很多事情的变化很快，故答案选D。
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My name is Adam and I'm a freshman at senior high school. Going from junior high school to senior high school is a really big challenge. The first week was a little confusing.
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