问题
选择题
Is it to hold the 2010 World Exhibition _______ makes Shanghai the focus of the world?
A．when
B．that
C．which
D．what
答案
答案：B
搜题请搜索小程序“爱下问搜题”
Is it to hold the 2010 World Exhibition _______ makes Shanghai the focus of the world?
A．when
B．that
C．which
D．what
答案：B
将Ba(NO3)2、NaOH、H2SO4、K2CO3四种无色溶液编号甲、乙、丙、丁，并两两混合，现象如下表所示：
| 甲 | 乙 | 丙 | 丁 | |
| 甲 |  | 沉淀 | — | 气体 |
| 乙 | 沉淀 | — | 沉淀 | |
| 丙 | — | — | — | |
| 丁 | 气体 | 沉淀 | — |
A．Ba(NO3)2、NaOH、H2SO4、K2CO3 B．H2SO4、K2CO3、Ba(NO3)2、NaOH
C．NaOH、Ba(NO3)2、H2SO4、K2CO3 D．H2SO4、Ba(NO3)2、NaOH、K2CO3