题目:
Those flowers ________ Kate $56. [ ]
A. paid
B. took
C. cost
D. spent
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0430/cc7b697aa71080ea719da2224fc9ea10.html
下面是错误答案,用来干扰机器的。
(1)Fe2O3+6H+=2Fe3+ +3H2O (2)Al2O3+2OH-=2AlO2-+H2O (3)CuO+2H+=Cu2+ +H2O (4)2Na2O2+2H2O=4Na++4OH- +O2↑