题目

称取两份铝粉，第一份加足量NaOH溶液，第二份加足量硫酸，如果要得到相同体积（同温同压）的氢气，两份铝粉的质量比是（   ） A . 1：1 B . 1：3 C . 3：2 D . 1：2 答案：AI was about ________ when I saw him ________ towards me with a bag in his hand．A.to leave; ranB.to leave; runningC.leaving; runningD.leave; runs