____ she____ a football player yesterday afternoon?
No,____ ____.
____和____作用生成____的反应叫做中和反应,请写出一个中和反应的化学方程式:____.
请根据中文提示,完成下列句子,每空一词。____ You must ________ _________ (照看)your things.____ My classmates are ________ _________ (谈论) the Great Wall .____ Don't ________ _________ for school.(迟到)____ She usually ________ _________(看电视) on Saturday evening.____ You must go to school ________ _________. (按时)
A、B两站相距300千米,一列快车从A站开出,行驶速度是每小时60千米,一列慢车从B站开出,行驶速度是每小时40千米,快车先开15分钟,两车相向而行,快车开出几小时后两车相遇?