—When _________ you have a book sale?
—Sorry, I _________ know.
A：are; don't
B：do: aren't
C：are, aren't
D：do; don't
bring give grandma then grandpa
The Mid－Autumn Festival is coming. I like it. I am very happy. My ____and ____ are going to come to my house. They are going to ____ gifts for me. And I'm going to ____ them gifts. ____ we will eat moon cakes together. We will be happy.
选项
事实
离子方程式
A
四氯化钛的浓溶液制备水合二氧化钛
Ti4++(X+2)H2O ⇌ TiO2•H2O+4H+
B
硫代硫酸钠溶液中滴加盐酸有淡黄色沉淀产生
S2O32-+6H+ =2S↓+3H2O
C
碳酸钠溶液显碱性
2CO32- +H3O+ ⇌ 2HCO3-+OH-
D
碘化亚铁溶液中滴加少量溴水，溶液变为黄色
2Fe2++Br2=2Fe3++2Br-
—Did you know China is one of the oldest countries in the world?
—Yes, I did. It’s ______ than the US.
