完形填空。 Tourism wasn't as important as it is today in China. In the past, 1 people could travel on holiday to other countries. But today more and more Chinese travel 2 they now are becoming richer and have enough 3 for travel. Special planes for tourists 4 travel less expensive than ever before. Not all people travel for 5 reason. Most people enjoy seeing countries that are different from their own. They also like to 6 new people and eat new food. Tourism causes many 7 in Chinese people's lives. People 8 new hotels and restaurants and 9 guides to show visitors interesting places. 10 tourists visit China every year. Tourism is clearly a big business. (     )1. A. few (     )2. A. if (     )3. A. energy (     )4. A. allow (     )5. A. the same (     )6. A. know (     )7. A. troubles (     )8. A. buy (     )9. A. attract (     )10.A. Millions B. a few B. unless B. time B. make B. same B. understand B. changes B. sold B. afford B. Millions of C. no C． because C. countries C. allows C. one C. find C. challenges C. finish C. train C. More than ten millions of D. many D. though D. places D. makes D. different D. meet D. accidents D. build D. choose D. More than ten million of