stores looking for bargains. But for 500 years, shoppers have gathered to an extremely large outdoor flea market known as the Rastro where they find everything from antiques to CDs.

　　Entertainment

　　No trip to Madrid is complete without seeing a performance of Spain's famous art form, flamenco. Every day, flamenco performers sing, dance or play the guitar in small cafes and grand theaters alike.

　　Food

　　Madrid has a wide variety of restaurants, but because the Spanish typically eat late at about 9 or 10 p．m., it's difficult to find good dinner food earlier. If you get hungry before then, the best solution is to try a tapas bar where light snacks are served. Be sure to try the jamon, a kind of dry－cured ham: Spain is famous for it.

21. What do we know about the Royal Palace in Madrid?

A. It has 50 rooms for visit. B. It can hold 2, 800 people.

C. It's been visited by 3 million people. D. It is thought to be the largest in Europe.

22. What kind of market is "the Rastro"？

A. For discount. B. For artworks. C. To sell various goods. D. To sell antiques and CDs.

23. What is a must when travelling in Madrid?

A. Having dinner earlier. B. Enjoying flamenco.

C. Visiting Prado Museum. D. Drinking in a tapas bar.

Years ago, I volunteered at a homeless shelter in Los Angeles, handing out food. Once I got talking with Albert., a tall and skinny young guy in line. He said he liked my socks. "Want to see mine?" he joked, lifting his leg. He was barefoot. I felt a sinking feeling in my stomach.

　　The next day, after work, I stopped at Ross and filled up my truck with socks. The following early morning, I drove over to Santa Monica's Palisades Park, which is a common destination for homeless people.

　　I took one of the bags from my trunk. It was still dark out. I headed for a group of three men, standing around a tree, probably using it as a windbreaker. Two were asleep under heavy blankets, and the third was digging through his collection. As I walked toward him, he watched me, perhaps questioning my motives. "I thought you guys might need some fresh new socks," I said, handing him a pair. He looked confused at first but took them and said, "Thank you." I gave him two more pairs for his friends.

　　I moved on. An hour later, I had given out all the socks. Most people were sleeping, and I felt like Santa. I knew that when they wake up they would find a very meaningful present.

　　That was nine years ago. Every week I'll hand out as many socks as I can. If I'm on vacation or on a business trip for more than a week, I bring a bag of socks with me and hand them out to the homeless on the streets in other states and countries.

　　It's extremely satisfying to operate "under the radar（雷达）" to help make some people's lives a little bit easier. Part of me hopes to see Albert out there one of these days, but even if I don't, I like to think one of the pairs will find him.

24. What does the underlined part in Paragraph I most probably mean?

　A. Sorry. B. Homesick. C. Regretful. D. Embarrassed.

25. What is Ross most probably?