A、To go to school. B、To take unique pictures. C、To visit his relatives. D、To make explorations. A

I’m a lifelong traveler. So. from the time I was nine years old I was flying alone several times a year over the North Pole, just to go to school. And of course the more I flew the more I came to love to fly. And then, almost inevitably, I became a travel writer so my job and my joy could become one. As you all know, one of the first things you learn when you travel is that nowhere is magical unless you can bring the right eyes to it.
    You take an angry man to the Himalayas, he just starts complaining about the food. And I found that the best way that I could develop more attentive and more appreciative eyes was, oddly. by going nowhere, just by sitting still.
    And of course sitting still is how many of us get what we most crave and need in our accelerated lives, a break. But it was also the only way that I could find to sift through the slide show of my experience and make sense of the future and the past.
    And by going nowhere, I mean nothing more intimidating than taking a few minutes out of every day or a few days out of every season, or even, as some people do, a few years out of a life in order to sit still long enough to find out what moves you most, to recall where your truest happiness lies and to remember that sometimes making a living and making a life point in opposite directions.
    And this has certainly been my experience as a traveler. Twenty-four years ago I took the most mind-bending trip across North Korea. But the trip lasted a few days.
    What I’ve done with it is siting sill, going back to it in my head, trying to understand it, finding a place for it in my thinking, that’s lasted 24 years already and will probably last a lifetime.
    The trip. in other words, gave me some amazing sights, but it’s only sitting still that allows me to turn those into lasting insights.
19. Why did the speaker fly over the North Pole?
20. What is the best way to develop attentive and appreciative views?
21. What do we learn about the speaker’s trip to North Korea?