【正确答案】Tibet Autonomous Region, with an average elevation above 4,000 meters, is the main part of Qinghai-Tibet Plateau, which is famous as 'the roof of the world'. Tibet is one of the provinces in China that has the largest number of international rivers distributed within. Brahmaputra River is the largest river in Tibet. It has a total length of 2057km, with drainage area covering over 240,000 square kilometers. Tibet is featured with cold and dry climate in northwest, and warm and humid climate in southeast. For many tourists who have not been to Tibet, the geographic and climatic characteristics of Tibet may easily cause some fear on them. However, if one can get good understanding of the climate in Tibet, properly protect oneself and take it easy with relaxed attitude, one will certainly be able to have a wonderful and memorable time in Tibet.