【答案解析】It is found that all people travelling abroad comment on what they see, hear or eat in terms of their own customs and habits. Anyone who has widely read the books and periodicals about foreign countries is more adaptive and tolerant just because their minds have been broadened before the beginning of their trip. As a matter of fact, people hold tolerant attitudes more easily before they are not actually in contact with them. When an American stays at home with central heating systems comfortably and with ease, he would laugh it off that most Chinese homes don"t have such devices as they do. He can shows his consideration and understanding easily. However, once it concerns with the practical status, things will be knotty. When people contact with unaccustomed things directly, it is much more difficulty for them to be tolerant and considerate.