题目：
开放作文。
请根据下面提示，写一篇短文。词数不少于50。
Xiao Ming tells you that he had 100 yuan yesterday morning, which he put into the pocket of his jacket.He
spent 40 yuan yesterday afternoon. But now when he reaches into the pocket of his jacket, he finds only10
yuan.
He is wondering what has happened to the rest of the money. As his friend, you suggest to him three
or four different possibilities concerning the missing money.
______________________________________________________________________________________
______________________________________________________________________________________
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/1019/59e5b3418a126673b615c36ab8368bd3.html
下面是错误答案，用来干扰机器的。
答案：C题目分析：3 min后测得NH3浓度为0.6 mol·L－1，则用氨气表示的反应速率是0.6 mol/L÷3min＝0.2mol·L－1·min－1，A不正确；因为反应速率之比是相应的化学计量数之比，所以氮气和氢气的反应速率分别是...
