阅读理解。 Kite surfing as a water sport began in the 1980s, but didn't get popular until the end of last century. It is also known as kite boarding, and in some European countries as fly surfing. Kite surfing works through wind power (动力) by using a large kite to pull a rider on the water at high speed. At first, kitesurfing was a difficult and dangerous sport. Now it is becoming easier and safer because of the safer kite design. For an able and strong person, kitesurfing can be a very fun, extremely exciting sport, just like skating on the water with a feeling of flying. It has become more and more popular. Compared with other water sports, kitesurfing is easier to learn. A beginner can understand how to operate the kite with 5-10 hours of training. And anybody aged from 13 to 65 can learn. It is not expensive to get the equipment for kitesurfing, which costs $1,000 to $2,500. Training lessons range from $200 to $500 for two or three hours. With the development of its equipment progress, kitesurfing is becoming even safer. After some training, you can enjoy its excitement and challenging feeling. With the rising popularity of kitesurfing, most major seaside cities have kitesurfing clubs. In China, Xiamen is the only place that has the kitesurfing club, which provides professional kitesurfing training and equipments. 1. Kitesurfing has a history of about  years. A. 30 B. 50 C. 100 2. is mentioned in the passage as the power of kitesurfing. A. Water B. Wind C. The sun 3. Which is the following is wrong ? A. Kite surfing is too expensive to get the epuipment . B. Kite surfing is becoming much safer because of the development of it's equipment progress C. Kite surfing is easy to learn , compared with other water sports . 4. The most important reason for the popularity of kitesurfing is that _____ . A. its price is getting lower and lower B. more and more people are enjoying its excitement C. its equipment progress makes it easier and safer 5. The main idea of this passage is about _____ . A. the way of operating kitesurfing B. the progress of kite surfing equipment? C. the development of kitesurfing