People who like traveling have their reasons. They believe that traveling can help them expand their field of view，especially in the geographical and historical sense. They also think that touring will give them more chances to enjoy different kinds of food and experience new things that would never be brought by other activities. But those who dislike traveling also have some reasons.
Traveling, in my opinion, does more good than harm. Most importantly,it broadens(使扩大)our mind. We can get in touch with other civilizations(文明)，cultures，customs and ideas.
Through history，most people traveled because of necessity(必要性)－not for pleasure. People traveled just in order to remain alive. They searched for food to eat or places to live in. They sometimes ran away from enemies. This is not to say that no one ever traveled just for fun of it. In ancient times，for example，rich Romans traveled all the ways to Greece to take part in the Olympic Games，and festivals. Of course，some people decided to travel just out of curiosity(好奇心).They wanted to find out what it looked like beyond the horizon(地平线).Also business travel has been going on for centuries. Traders could not only make money but also learn to speak several languages and be introduced to different cultures.
So，traveling does enrich our mind and draw new ideas to us. There is no doubt that we can get much from it.
21. The underlined word “expand” in Paragraph 1 can be replaced by“ ”.
A. widen B. protect C. lose D. decide
22. According to the passage，in the past most people traveled .
A. for fun B. for knowledge
C. to get experiences D. to make a living
23. How many reasons for traveling are mentioned in Paragraph 3?
A. Three. B. Four. C. Five. D. Six.
24. What’s the main idea of this passage?
A. Different kinds of traveling.
B. Traveling enriches our mind.
C. Ways to enjoy yourself while traveling.
D. The advantages and disadvantages of traveling.