Which of the following is TRUE?

参考解析：

细节理解题。根据第二段最后一句“After the couple heard my reason, they understood that the problem was caused by cultural differences, so they laughed and were no longer angry”可知听完作者的解释，那对夫妇笑了，不再生气，所以A项错误；根据文章最后一句“but now I don’t show my feelings through words”可知作者不再用语言表达他的尊敬之情，所以B项错误；根据第二段倒数第二句“I then waked back to the table and apologized to the wife.”可知是作者给那对夫妇道歉，而不是经理，所以C项错误；根据第四段第一句“However, in the United States, people think ‘growing old’ is a problem since ‘old’ shows that a person is going to retire or that the body is not working well.”可知通过这件事情，作者学习到了更多的美国文化，所以D项正确。故选D。