问题
选择题
Mum is sleeping. Don't _______. [ ]
A. to wake her up
B. wake her up
C. to wake up her
D. wake up her
答案
答案：B
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Mum is sleeping. Don't _______. [ ]
A. to wake her up
B. wake her up
C. to wake up her
D. wake up her
答案：B
除去下列物质中的少量杂质所选用的试剂或方法正确的是( )
| 选项 | 物质 | 所含杂质 | 所选用试剂或方法 |
| A | NaOH溶液 | Na2CO3溶液 | 稀盐酸 |
| B | CaO | CaCO3 | 高温灼烧 |
| C | CO2 | CO | 点燃 |
| D | 稀盐酸 | 稀硫酸 | 加适量Ba(NO3)2溶液，再过滤 |