numbers, and if you aren't as happy with it as I am, you can return it for a refund of the purchase price.

21. Why did the author's book group make fun of him?

A. His car always broke down.

B. He was famous for his meanness.

C. He didn't keep up with the times.

D. His grandkids lost touch with him.

22. The author finally got a Jitterbug phone _____.

A. because of its free gift

B. because of its convenience

C. because his friend sent it as a gift

D. because its numbers were his favorite

23. What's the main purpose of this text?

A. To advertise the Jitterbug phone.

B. To introduce how to enter the digital age.

C. To describe the author's personal experience.

D. To show users how to use the Global Positioning System.

Adventure races are such a huge challenge that when you enter a race, you always think, "Am I ready? Did I train enough?" I remember one race in particular, my very first Eco-Challenge and only my second race ever. (The Eco-Challenge race is a multi-day event where teams of four men and women compete non-stop over a 300-mile course which includes canoeing, horse riding, scuba diving, mountaineering, mountain biking and so on.) I have never felt that unprepared and frightened in my whole life. My background was cross-country running in high school and college where a two- or three-mile race seemed long. Most of my fear was due to lack of experience and knowledge. I really had no idea what I was getting into. I had done one 24-hour race that happened to be an Eco-Challenge qualifier (资格赛). I was like a deer caught in headlights the whole way. However, we won the race and were invited to compete in Australia.