閱讀下面短文，掌握其大意，然后從每題所給的四個選項(A、B、C和D)中，選出最佳選項。
Knowledge can be usually got in two ways：books and experience．The latter is no less 1 than the former, and the best means for getting knowledge of the latter is to 2 ．Only by travel can one see things outside one's hometown． 3 , suppose you have heard and read about New York and have 4 seen many pictures of it, but you only have a very vague(模糊的) 5 of it unless you have personally visited 6 ．
Travel can make us know more and 7 more．Through traveling we can get the 8 of geography, customs, cultures, and lifestyles of different places and countries．In travel, we can 9 more friends and know more about the 10 of other countries and the different ways of 11 ．Travel is also one of the best ways of pastime． 12 long period of had and tense(緊張的work, we can 13 ourselves completely by traveling to enjoy the beautiful places, to visit historic interest, to see different cities of country-side, to meet famous people and to 14 nice food．
Further, travel is good for 15 ．One who keeps him indoors all day long is likely to be 16 ．By traveling we can get the chance to climb mountains, walk on foot, do more 17 and breathe more fresh air．
Nowadays with all the comforts easy to get and the 18 speed, many people travel to other places and even other countries just for the sake of 19 and sightseeing．Traveling is really beneficial(有益的)in many ways．It's well 20 the time and money．
