问题
选择题
| —________ are they talking about? —Our English teacher. |
A. What B. Whom C. Whose D. When |
答案
答案：B
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| —________ are they talking about? —Our English teacher. |
A. What B. Whom C. Whose D. When |
答案：B
下列四组物质中符合图（“﹣”表示两端物质能反应）所示关系的是
| 甲 | 乙 | 丙 | 丁 | |
| A | CO | O2 | H2SO4 | CuO |
| B | Mg | HCl | CaCO3 | NaOH |
| C | Ca（OH）2 | SO2 | NaOH | HCl |
| D | Na2CO3 | Ca（OH）2 | HCl | CaCl2 |