A、Traveling in it. B、Studying its language. C、Living in it. D、All of the above. D前3项在文中都有所提及，所以选D 。

Every country tends to accept its own way of life as being the normal one and to praise or criticize others as they are similar to or different from it. And unfortunately, our picture of the people and the way of life of other countries is often a distorted one.
    Here is a great argument in favor of foreign travel and learning a foreign language. It is only by traveling in, or living in a country and getting to know its people and their language that one can find out what a country and its people are really like. And how different the knowledge one gains this way frequently turns out to be different from the second hand information gathered from other sources! How often we find that foreigners whom we thought to be such different people from ourselves are not very different after all!
    Differences between peoples do of course exist and, one hopes, will always continue to do so. The world would be a dull place indeed when all different nationalities behave exactly alike, and some people might say that we are rapidly approaching this state of affairs. With the ease of travel, there might seem to be some truth in this at least as far as Europe is concerned. However this may be, at least the greater ease of travel today, has revealed to more people than ever before that the Englishman or Frenchman or German is not some different kind of animal from ourselves.