题型:填空题 It was raining hard. _____ he didn't have an umbrella.[ ]A. Unfortunately B. Luckily C. Because D. So 查看答案
题型:填空题 “嫦娥一号”在绕着地球做椭圆轨道运行,它在近地点时的速度______远地点的速度(选填“大于”或“小于”),从远地点向近地点运动的过程中,动能______,势能______(选填“增大”或“减小”) 查看答案