问题
选择题
—I am going to Sanya with my family for the National holiday.
— _________.[ ]
A. That's not a good idea.
B. Good luck.
C. Take care.
D. Have fun.
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—I am going to Sanya with my family for the National holiday.
— _________.[ ]
A. That's not a good idea.
B. Good luck.
C. Take care.
D. Have fun.
答案：D
下表所列各组物质中，物质之间通过一步反应就能实现如图所示转化的是（ ）
| 物质 编号 | 物质转化关系 | 甲 | 乙 | 丙 | 丁 |
| ① |
| Cu | CuO | CuCl2 | Cu（NO3）2 |
| ② | Na2CO3 | NaOH | NaHCO3 | CO2 | |
| ③ | （NH4）2SO3 | CaSO3 | SO2 | NH4HSO3 | |
| ④ | Al（OH）3 | Al2O3 | Na[Al（OH）4] | AlCl3 |
A．①②③④
B．①②③
C．①③④
D．②④
