问题
选择题
Only after I read the text over again _____ its main idea.
A．that I knew
B．did I knew
C．1 could know
D．I did know
答案
答案：B
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Only after I read the text over again _____ its main idea.
A．that I knew
B．did I knew
C．1 could know
D．I did know
答案：B
下列实验操作与预期实验目的或所得实验结论一致的是[ ]
实验操作 | 实验目的或结论 | |
| A． | 某钾盐溶于盐酸，产生能使澄清石灰水变浑 | |
| 浊的无色无味气体 | 说明该钾盐是 | |
| B． | 向含有少量 的 溶液中加入足量 | |
 粉末，搅拌一段时间后过滤 | 除去 溶液中少量 | |
| C． | 常温下，向饱和溶液中加少量 | |
| 粉末，过滤，向洗净的沉淀中加稀盐酸，有气 | ||
| 泡产生 | 说明常温下 | |
 | ||
| D． |  与浓硫酸170℃共热，制得的气体通入 | |
酸性 溶液 | 检验制得气体是否为乙烯 |