题目

真空中的光速是c=__m/s,是宇宙间最快的速度。从比邻星发出的光，要经过4.3年传到地球，那么比邻星与地球相距__千米，为__光年。 答案：3×108m/s       4.068e13        4.3解析:略排序题A. Li Ming gets the tickets.B. Mr. Li drives Jenny, Danny, Li Ming and Mrs. Li to the train station.C. “Good-bye. Have a good trip!”D. “Danny, don’t buy the fruit. The train is leaving. Don’t forget your coat.”E. Danny is buying fruit.F. Danny runs to the train.正确顺序为：____________________