问题
选择题
He's got himself into a dangerous situation he is likely to be accused of meeting someone. [ ]
A. where
B. which
C. while
D. why
答案
A
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He's got himself into a dangerous situation he is likely to be accused of meeting someone. [ ]
A. where
B. which
C. while
D. why
A
下列实验中，根据有关现象得出结论，合理的是（）
| 实验操作 | 现象 | 结论 | |
| A | 向盛有少量无色溶液的试管中滴.加酚酞试液 | 溶液变红 | 该溶液一定呈碱性 |
| B | 向盛有少量无色溶液的试管中滴 加氯化钡溶液 | 出现白色沉淀 | 该溶液中一定含有硫酸根离子 |
| C | 向盛有少量固体的试管中滴加稀 盐酸 | 产生气泡 | 该固体一定含有碳酸盐 |
| D | 点燃某气体，在火焰上方罩一个 干冷的烧杯 | 烧杯内壁出现水珠 | 该气体一定是氢气 |