Sun Yang, Olympic and world swimming champion of China.has received ___indefinite ban from competltion following his seven-day detention for driving without a license A.the;an B.an;/ C.an:the D.the;/ 答案:A读“我国不同经度范围和气候带城市数量分布图”,回答下面小题。【1】影响我国城市分布的主要自然因素是( )①地形 ②交通 ③气候 ④经济A. ①②B. ①③C. ③④D. ②④【2】我国最东部(130°E以东)和最西部(90°E以西)城市数少的主要原因是( )①最东部面积范围小 ②最东部冬天太冷③最西部为少数民族聚居区 ④最西部自然条件差A. ①②B. ③④C. ①④D. ②③