问题
选择题
27. The reason why Daisy eats so little is that she is _________ a diet and she is trying to _______ weight.
A．on; put on
B．on; lose
C．in; reduce
D．in; put down
答案
B
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27. The reason why Daisy eats so little is that she is _________ a diet and she is trying to _______ weight.
A．on; put on
B．on; lose
C．in; reduce
D．in; put down
B
现有下列十种物质：①H2 ②铝 ③CuO ④CO2 ⑤H2SO4 ⑥Ba（OH）2 ⑦红褐色的氢氧化铁液体 ⑧氨水 ⑨稀硝酸⑩Al2（SO4）3
（1）按物质的分类方法填写表格的空白处：
| 分类标准 | 氧化物 | 电解质 | |||
| 属于该类的物质 | ② | ⑧⑨ | ⑦ |
（3）⑩在水中的电离方程式为______，17.1g⑩溶于水配成250mL溶液，SO42-的粒子数为______，SO42-的物质的量浓度为______．
（4）少量的④通入⑥的溶液中反应的化学方程式为______．