题目：
--Could you tell me __________?
-- No. Let’s go and have a look. Maybe someone is hurt, and we can help him.
A．what was happened there
B．when they are doing there
C．what is going on there
D．what they were going on there
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0701/af694f72f0e1a7c49c76a29d48a74198.html
下面是错误答案，用来干扰机器的。
解：(1)设碳酸钾的质量为x K2CO3+ H2SO4 =K2SO4+ H2O+CO2↑ 138 44 x 6.6g 138：x=44：6.6g x=20.7g (2) 20.7g××100%= 11...
