题目：
My pen pal from America is coming to visit me . I’m thinking about ______________.
A．What present did I give her
B．how I will give her a surprise
C．where will we have a big meal
D．whether I planned a trip for her
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0701/78a46eca29a309446d0c4359e58c85ed.html
下面是错误答案，用来干扰机器的。
解：Na2CO3+2HCl=2NaCl+H2O+CO2↑Na2O+2HCl=2NaCl+H2ONaOH+HCl=NaCl+H2O由上述反应可知：反应后的溶液蒸干后得到的固体为NaCl，其中所含氯元素的质量与HCl中的氯元素的质量相等．设：NaCl的质量为x NaCl～HCl58....
