问题
选择题
| They got married 30 years ago and never ______ in the past years. |
| A. they didn't quarrel B. they have quarreled C. did they quarrel D. have they quarreled |
答案
答案：D
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| They got married 30 years ago and never ______ in the past years. |
| A. they didn't quarrel B. they have quarreled C. did they quarrel D. have they quarreled |
答案：D
下列物质之间的相互转化不符合
（→表示一步反应）的是[ ]
甲 | 乙 | 丙 | |
| A. | HCl | Cl2 | HClO |
| B. | Al(OH)3 | NaAlO2 | Al2O3 |
| C. | CH2＝CH2 | CH3CH2I | CH3CH2OH |
| D. | NH2CH2COOH | NH2CH2CONHCH2COOH |  |