题目

--What do you often do_______classes to relax yourselves?   ---We often do eye exercises, listen to music or do some running around the school.     A. in           B. among          C. between          D. through 答案：C 纬度大致相同，拉萨的气温比成都低的原因是（ ）A．纬度因素 B．地形因素C．洋流因素 D．海陆因素